A broken keyboard.
Seriously, 20 posts and no one?
If the bargain table at B Dalton can be considered a thrift store – first edition of Game of Thrones for $3.99.
A pair of exquisitely tailored, fully-lined wool gabardine slacks - can’t remember the maker. When I say exquisitely tailored, I mean that the finished interior details look like they were done at an expensive man’s tailor shop. You just can’t find this quality in women’s wear, especially not nowadays. They were about $6.
They fit beautifully and they’re a nice shade of olive. That’s another thing: almost all new women’s pants are either jeans or black slacks. Good luck finding any good slacks with a little color to them.
I also have a Ralph Lauren silken top that I bought at GoodWill for about $3. It’s either a thin sweater or a classy long sleeved T-shirt, I can’t decide which. It’s deep burgundy and I’ve been wearing it for years now.
I buy all my jeans at Salvation Army. The one near me has a 150 foot rack full of them. By the time I’ve browsed about 10 feet along it, I’ve found several good designer pairs that fit and cost about $3. No need to pay $40 for a new pair!
A ecru silk blouse with mother-of-pearl buttons. It was very old, to judge by the style. 1940s, maybe. 10 cents. In the 90s. Still have it.
Neiman Marcus men’s leather jacket, busted zipper, but otherwise mint. The smoothest, most beautiful grain leather I can recall seeing a jacket cut from. Bought it for my boyfriend for Christmas in 1994 - last time I crossed paths with him, he was still wearing it. Still looked great. Fifteen bucks minus 10%. $13.50 (plus having a new zipper sewed in.)
A china & crystal resale shop sold me three serving platters in my china pattern (retail $160 each) and two vegetable serving bowls ($100 each) for $50. They apparently had misidentified them as dinner plates and soup bowls.
Same shop sold me an uber-rare piece of barware in my crystal pattern for $20. Routinely sells on eBay for $275 these days.
I got a 10 amp 12 volt power supply for $8. It’s the kind repair shops would use for bench testing car stereos and CB radios and such. It cost around $200 new.
I used to pick up silk or wool sport coats for three to eight dollars each. Haven’t had the need to wear such items in the last three years.
A framed print of a helmeted shrike by Louis Agassiz Fuertes - $5.
Not on the order of a copy of the Declaration of Independence, but I thought it was cool.
I picked up a very nice dining table and five chairs for $225 or $250, I can’t remember which price now. This set was exactly what we needed at the time, and it’s Ethan Allen, and retails for about ten times that price. I’ve also picked up a desk that was smallish, but it was what I needed.
A few years ago I picked up a pair of R. M. Williams boots (a short riding/dressage boot) that currently retail for $425 for $3 (AUD). Sure, they needed re-soling, but still, the total cost was only $28!! Boots are still going strong too.
A crimson suede jacket for $1.00. More recently, a cast-iron camp oven for $20.
I’ve always been an avid Thrift Store shopper, but my kids were always too embarrassed to wear the clothes etc when they were young teens. That was until they realised they could get new or near new designer labels for just a few bucks. Nowadays (in mid-twenties to early thirties) they gloat about their ‘finds’. Just last week my daughter found a pair of jeans that retail for $250 for $2.
Alas, I’m too old and out of the loop now to recognise the name of the designer. Back in my youth, Levi’s were the height of the fashion pinnacle. 
One of those as-seen-on-TV juicers that retail for like $50. Figured it wouldn’t work, but it was worth $3 to find out. Worked like a charm. Probably kept me from getting scurvy post-college.
Well I do usually go in there with “$20 in my pocket.” 
Which raises the question: What is a skeet blanket anyway?
ETA: Ooooooh.
A pair of fit-like-a glove ski boots for $2.
My mom once paid $5 for a mink-like fur coat she was going to cut up for some craft she was making. She took it to have it cleaned and it turned out to be real. Score!
Got a pants press, worth hundreds, for $25. I got a still wrapped 3d puzzle of San Francisco, in catalogs for $50, for $10.
Ann Taylor 100% cashmere sweater for $7.
Don’t laugh but I deconstructed it for the yarn. The sweater was nothing special and the color was hideous electric pink. Now I have a couple hundred dollars worth of cashmere yarn, awaiting its destiny (I dyed it a plum color).
A Brooks Brothers shirt that retails for $135, mine for 3 bucks at the local thrift store. I’m still smiling!
I’ve seen the prices of some better yarns. I wouldn’t dream of laughing. Especially since I’ve bought clothes to cut up for scraps. Look what this woman did with thrift shop shirts. If you ask the clerks, they can usually tell you about the pile of stuff they have set aside because it has holes or stains in it…and you can buy that stuff for a song. Sometimes you can have it for free, as long as you’ll haul it away and promise not to bring it back!
Signed Rod Mckuen album for a quarter.
I know, Right?
My mum used to do this when the grandkids were little. Except she only bought hand-knitted jumpers or cardigans, and would create the most brilliant one-piece overalls from unraveling the wool.
Back in the early eighties, there must have been a lot of* beige* jumpers going to the Op Shop. 
A $3.00 pair of pants that had a $10.00 bill in the pocket.
ETA: Ooops, should have read above
Bought a Sony SL-HF900 Superbetamax for very little, years ago. Fun machine with the flip-down jogwheel/settings panel. Used it for a while and then sold it on eBay. Regretted that. Got a lot more than I paid for it but still not as much as I had hoped. Wished I had kept it.
Lots of electronics, esp. computer, stuff over the years that is nice. E.g., a laptop that had its HD taken out so the store put it out for cheap since it didn’t run. I had a laptop HD lying around, also from a thrift store. (That one was a real steal. Even got a senior discount on it.) Put it in, added an OS, etc. Still works. Most importantly, the two batteries that came with it are good. It was my traveling computer until I got my Nook HD+ recently.
Yeah, I got one of those great Eddie Bauer shirts for a buck or so. I like it, Mrs FtG loves it. She wanted to get more for me. Looked up the retail prices. Oooh! If only there was some way to magically know when such things were on a rack at a thrift store nearby.