Some foods, I just don't go through enough of and end up throwing away half of what I buy. I'd like Mini portions on some things, these might go great in the Oops case next to express checkout.

Molasis (as seen in Cracker Barrel)
Sour Cream (the size you get with a baked potato at Wendies)
Cream Cheese (as seen in other Krocery stores sold next to the Bagels)
Half and Half, served everywhere that coffee is served (except ironically at starbucks).
Salad Dressings.
There are even some fast food sauce packets I would consider buying. Popeyes Louisiana hot sauces, Arbies horseradish, Famous Dave's BBQ, Chineese duck sauce.

I think there were more but those are the ones I can remember right now. I can imagine that they might not be caust effective, but it doesn't hurt to ask or look into it. You might get companies to make promotional sample packets to reduce the cost.

I looked into the half and half packets at GFS but would need to buy a case, which defeats the purpose of buying the mini packets, I only need a few a week.