I liked the Doritos 3D. They’re were like the bastard child of Doritos and Bugles, and they were delicious.
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Safeway/Dominick’s used to carry a honey ginger ale that was discontinued. I contacted the maker to see if anyone else distributed it in the area and the best they could do was to say “Check on Amazon”. Mail ordering soda isn’t really in the cards for me.
I had a chemistry set from the late 70’s or early 80’s that had about twenty bottles of chemicals. Naturally, you tossed the instructions aside and start mixing stuff at random. This led to a large blue stain on the carpet and, better yet, my penny-cleaning solution. I made a brew that instantly turned pennies bright and shiny. So I grabbed the giant spare coin jar and treated every penny we owned.
An hour or two later, every one of them was bright green, presumably from corrosion. We were finding those green pennies in the house for the next 15+ years.
Those were nasty. To each their own.
My mom bought me a bottle of this when I was a tall, skinny and gawky 11 year old. She knew I loved the Donald Fagan song “New Frontier” and wanted to make me feel like I was the big blonde wearing Ambush and a French twist. I love my mom.
My local supermarket sells Flex shampoo, so it’s still out there.
In no particular order…sour cream and onion Doritos, picadilly jelly cookies, Fruit Brute cereal, Cap’n Crunch vanilla cereal with the whale, and bacon puffy cheetos!! Oh, to be a kid again!!!
“Pachinko Pale” nail polish by Essie.
Bastidges.
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Chicken Helper Teriyaki Flavor
There was also “Incredible Edibles” - you could make bug-like things out of the “Goop” that was edible. I use “edible” in the weakest form of the word; I can still taste what passed for “mint” almost 40 years later and it isn’t/wasn’t pleasant 
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Wow, that’s an obscure one, but too true. I find getting the sandwich unsliced…disturbing. I actually only buy them to go, on my way home so I can slice it in two as soon as I get through the door. And yes, I recognize how OCD that sounds.
I hate mint, any type of mint, especially with toothpaste. For a short period of time, Colgate made a Colgate® Luminous™ Paradise Fresh which was clean tasting, but not minty. Suddenly, it’s dissappeared.
There also used to be a razor called Flicker. Very simple and it is the ONLY razor that doesn’t cause a major case of razor burn. It’s been discontinued, so now I have to use an electric razor (no razor burn, but not a close shave, either.)
Damn, we had the girder-and-panel set when I was a kid, and those things were awesome. Also, whether by accident or design, they were scaled to match up pretty well with our Corgi and Dinkey cars, so we could not only reproduce a city, we could have horrendous traffic too!
Which brings me to Dinkey toys. Beautifully-rendered die-cast vehicles, mostly exotic (to us) British and European types. Corgi cars carry on the tradition, but are hard to find and now seem to be pitched more to adult collectors.
Was that the purple kind that tasted kind of flowery? I picked that up on a whim once and really liked it. Never found it again.
I had forgotten about Mint Snapple until I read your post. I loved it too! I haven’t seen it anywhere in a long time. 
I miss Saint Ives Swiss Vanilla lotion. It had this awesome faint smell of cookies baking but wasn’t too overpowering. Seems to have disappeared around here.
Deliberately designed at HO scale, matching various toy trains and cars. (Isn’t it funny that I can actually remember reading that in the instruction manual—on Christmas Day 1965?)
One thing I have absolutely not been able to find is an old-fashioned sink strainer. A triangular plastic (usually) container with holes in the bottom that sits in your sink and strains garbage. Looked all over the internet and found some antiques at high prices (they ought to cost a couple bucks) but it appears no one is making them any more. Not everyone has a garbage disposal.
Mrs. Stahl’s knishes are no longer available, at least not at the Brighton Beach subway stop.
And even in NYC, I have never been able to find old-fashioned rye bread. All sorts of things called rye bread, but not the real thing.
I remember those - they advertised you “couldn’t” nick yourself with them. I shaved a .25 x 4 inch piece of skin off of my shin with that damned pink little bastard.
I think you can get Teaberry at Cracker Barrel restaurants. I don’t remember if they have Beeman’s or Blackjack, though.