I found something interesting at PetSmart...the 10 gallon I got was cheaper than the 2.5 gallon I got. Weird. Tell them they can get a 10 gallon pretty cheap, or a 2.5 gallon if they dont have a lot of space, and he will be happy as a clam...although I've never seen a happy clam. :/
Attempting to purchase the little guy is a great idea. I don't think that these people are fit to own an animal if they're so cheap that they refuse to buy it a proper enclosure. A bowl isn't that expensive, so I don't understand why they can't go to the store and purchase one.