Honestly, Donny didn't have much he wanted to buy. Or rather, he knew that he didn't have enough for anything aside from grocery shopping. So that's what he did. Most of his money went to a portable gas stove and and Microwave Oven, and he budgeted himself for other things such as medical supplies and and tools. He wasn't much of a repair man, but even he knew how to fix a leak. Once he had his things he went to the counter to pay for it, and than hid near the front waiting for Roxy to be done.