Most kids love diving, and a lot of parents dive with their kids. You can try advertising for a buddy on one of the AOL message boards or on the alt.dumpster newsgroup on the internet. Buddies are occasionally made that way. But don't feel bad if someone doesn't want a partner even if they live near you. Folks spend a LOT of time developing their sources, and they don't always want to share those sources with others.
Divers are especially protective of their food sources.
Plus, dumpsters end up getting locked when lots of folks start frequenting them. The Dumpster Lady saw this happen with her favorite housewares store dumpster after she mentioned it at a dinner party. People you don't know. You will eventually get to a point where you won't care one bit who sees you dive or who knows that you dive. You can always dive far from home if you've got a reputation to maintain.