Chef Boyardee Mini Cheese Ravioli in Tomato and Cheese Sauce. They have similar things now, but they all have meat in them somewhere.
Fizzies!
And my favorite Junket product was … Junket. Can’t believe they still make it.
Pudding pops are back, and they’re still quite good. They still have that unnerving tendency to bend as you lick them.
As a kid, I used to love Campbell’s Wonton Soup - basically their same ol’ chickenesque broth with these thick doughy triangles with minced chicken inside. Haven’t seen that in years.
Old Tyme Jamaican Style Ginger Beer. It still exists, but not here.
Pringles made chips that were thick, made of corn, and had powdered cheese. Loved them.
Susan
Space Food Bars
I used to love Freakies! To this day the song from the commercial pops into my head from time to time. We are the Freakies! We are the Freakies! And this is the Freakies Tree… My rat-bastard best fiend still has his Freakies club membership papers.
I can’t really think of any favourite but unavailable old foods. I guess I liked Jack-In-The-Box’s Bonus Jack, which they no longer have. And the Peter Paul Caravelle Bar. I haven’t had a Straw Hat pizza since I was a kid, but I think there are still one or two stores around in SoCal.
But if they still sold Freakies in stores I’d probably buy a couple of boxes a year.
A soft drink from the Coca Cola bottling company, called, Simba. With a lionembossed on the bottle.
Oddly, I don’t believe I ever saw it in a can…
Also Brew 102. Does beer count? I still try to remember where the brewery was when i drive through L.A.
Kellogg’s OK cereal. Like Post Alpha-bits, except it only had Os and Ks, IIRC.
And one of my favorite foods back in 1956 was Gerber’s strained carrots. Man, I haven’t had a jar of that for years…
I’ve seen Campbell’s wonton soup on and off for years. Has anyone seen Campbell’s beef noodle soup lately? I haven’t seen it the last few times I looked, and I miss it.
They’re still made. My grandson showed me a stack of them the other day. Rhesus Pieces, Vomit Cleanser, Baddy’s Headache Powders, Poopsi Cola, etc.
My item for the no longer made is Milk Shake candy bars.
Cracklin’ Oat Bran circa 1985. Somewhere before it went bye-bye they changed the formula and it kind of sucked after that, but before it was like eating cookie cereal.
Orbitz, some kind of weird, noncarbonated transparent beverage. Inside it were little fruity jelly balls of equal density… They sort of… hovered in the liquid.
I haven’t seen the chocolate kind of Flintstone’s Fruity Pebbles in a while. I hope it’s alive and well out there.
It’s probably still for sale, but Lik-m-Aid was my favorite treat to get from the pool concession stand when I was a kid (and we went to the pool every day).
Colored/flavored sugar that you ate by licking a stick made of sugar and dipping said stick into the colored sugar. Then when you’re done, you eat the stick! What’s not to love?
Just thinking about the amount of sugar in that gives me a headache 
Dr. Pepper Gum - it had Dr. Pepper syrup in the middle.
Circus Fun Cereal - with horses, hoops, balls, bears, elephants, and lions (and tigers)
Crunch Tators Mighty Mesquite Potato Chips - every time I watch Home Alone I wish for them.
Hormel’s Frank’n’Stuff hotdogs, with a core of Hormel chili in the middle. Almost like a chili dog, and much, much neater to eat.
Technically, they’ve returned. 
I LOVED the one with the red balls. One day, Orbitz was here, then the next day it wasn’t.
You’re right, it is still made. I can always find it up at the counter at CVS, Rite Aid, etc.
To add my own, I’ve had a hard time recently finding Keebler’s Soft Batch cookies (dangerously undercooked chocolate chip cookies in a red bag). What I wouldn’t give for a bag right now.
Quisp Cereal. Sorta like Cap’n Crunch, but didn’t tear the roof off your mouth.
Oh yes - it’s still available, sorta, at http://www.quisp.com
“…In the afterlife, you will be headed for some serious strife…”*
For me it is Delfa Danish Rolls, a strwaberry licorice, and banana flavored marshmellows. Mmmm!
*Thanks for the Squirrel Nut Zippers reference, Projammer! 
Mr. Fip’s Pretzel Chips. If they still exist, please tell me where.