As far as dumpster diving goes, it works for a lot more than food. You can find lots of great stuff in there (depending on what dumpsters you dive) that you can trade for whatever you need/want. Do a google search, you'll find sites about it, people finding all kinds of great stuff, electronics, musical instruments, books, music, picture frames, etc. Stuff you can't imagine people throwing out.
Truth! I've even found money in dumpsters.
Again, college towns . It's amazing what some of the students throw away, especially at the end of each semester when they're going home on break and especially after graduation.
I've found brand new clothes with the tags still on them, appliances that worked just fine, boxes of canned goods, jewelry, lots and lots of books, cd's, and, my favorite, bikes and bicycle parts.
sometimes the kids throw away something perfectly good just so they don't have to cart it home with them.
I know of people that make quite a bit of $ just picking through the students discards and selling them at the swap meets and flea markets.