I am a vendor for my own book at Amazon Marketplace. I just made my first sale and it was fun! I recommend listing your self-published books there. Actually, you can sell any book there from what I can see.
My book was listed at $10.00 plus shipping of $3.99. I chose to ship myself. I will receive $10.00 from Amazon as they take out a $3.00 plus fee. I shipped for $2.98. Thus I will receive $7.00.
These are the Publish America books published in 2006. I paid about $7.00 for each book I still have so at least I break even.
Pricing your book to sell just under the the other sellers and still make a bit of profit after shipping cost is the trick.
Now that I am an established vendor of books, I can list others for sale too. Just thought I would share in case, like me, you overbought from PA or another printer.