Getting books - where to find them?

After the previous post I feel somewhat compelled to write a little on whereabouts I go when I'm trying to find a book to read.

It seems that some people have discovered some of the basic locations where to locate used books, so I figured that I would mention some of the more-advanced places to go searching for books. These more advanced search engines actually will search Alibris, Abebooks, and a number of other places so that you don't have to search them separately. (Does this make them meta-search-engines?) I'm thinking here of two different sites: AddAll.com, and BookFinder4U.com. Beware that both of these sites have separate searches for new and used books, and that sometimes these categories overlap.

Beyond the sites mentioned above, about the only other places I think of looking to are Froogle, eBay, and Regent College's Bookstore. Beware that as far as book selling is concerned there seem to be a fair number of sellers doing somewhat scammish things. Often I'll see books there with a cheap list price (say $5), but that will charge you more than $20 for shipping.

Libraries also shouldn't be forgotten. I've tended to avoid CanRC church libraries over the years, as the books that tend to go into them seem to be somewhat unbalanced in focus (I like to hear more than just one side of the story). A community membership at a decent-sized theological college library might work though.

At the moment I have some sort of borrowing privileges at a number of different libraries: University of Calgary (technically I have alumni privileges at SFU but the U of C membership makes it redundant), Surrey Public, and Fraser Valley Regional. There's a fee for the Calgary Public Library which is just high enough that I haven't bothered to get a card there yet. University libraries can get you pretty much any non-fiction you want, and in my case its a semester loan for most material. Public libraries are OK for fiction, but I'm not a fan of the shorter loan periods.