How about grocery stores? $9-$12 reimbursement for your groceries, plus a small payment. Don't see why you can't buy candy. I used to get laundry detergent, bottled water, and everyday items all the time.
And as another poster mentioned, lots and lots and LOTS of c-stores and gas stations -- may not pay much, but you can accumulate a lot of candy really, really fast!
Although I freely admit the last gas station I did, you couldn't buy a candy bar for the amount of the reimbursement, LOL!!! Never thought I'd live long enough to see an ordinary Hershey bar cost almost $3.