I've sold the odd book on amazon & ebay U.K.. Both worked very well. I got my money, and the people got their books.
They were quite geeky books though. For some (probably bad) reason I assume that the sale and purchase of geeky books is less likely to be subject to fraud and deception.

My experience with a Canadian bookseller (on ebay or half.com) was AWESOME for ME, probably not so good for her if she knew what the book she sold me was really worth!

I once got an out of print, first edition copy of the snuggle bunny by nancy jewell worth nearly $100.00 (varies) for $7.00 plus shipping from a lovely lady in Canada who didn't realize it was a widely sought collector's item in the United States.

If I had a point to my story, it'd be check your title values before you sell.

www.bookfinder.com is the Rosetta stone for bibliophiles

My problem with selling books through Amazon is having to buy an envelope or shipping box, pack them up, and take them to the post office during open hours to have them weighed. If it's a pricey tech book or art book, it might be worth it, but if it's just a novel or something and there's already 15 people selling a copy, it's just going to sit around your house forever. It's much easier to just pack em all up at the same time and take them to a real used bookstore, of which I'm sure you have many in Vancouver. Sort out the quality stuff and take it to the little locally owned store where you go all the time and they know your face and you'll get a pretty good trade price, and then take the rest to big chain used bookstore (here it's Half Price Books) where they'll take any old crap regardless of quality but won't give you as much money for it. This is my 3-tiered bookselling system.

US Centric: I sell paperbacks, CDs, and DVDs through half.com (~10-15 per week) - the key to skipping the post office is to guess the weight and slap stamps on it to correspond generally with media mail rates and drop them in the mailbox on the way to work. Textbooks always have to be weighed though - I can never seem to remember the scale on the bigger books.

There are really only 3 weight ranges I worry about - $1.11 for the lighter books, CDs, & DVDs that you can ship 1st class (up to 4 oz.), $1.59 for the medium/most common books & double CDs - less than 1 lb., and $2.07 for up to 2 lbs. Just make sure you write whether it is media mail or first class on the envelope. I have never had a problem if I am a little under on my guesstimate of weight.

I hate going to the post office, so I keep a stock of $1 stamps, $0.23 postcard stamps, and the regular $0.39s. I also buy 6.5" X 9.5" manilla envelopes & bubble mailers in bulk, so they are always on hand too. Having return address stickers saves a bunch of time as well.

I tried Amazon.com, but found that half.com got more used book traffic (though that was over two years ago, so that may have changed since then).