I don't see the price range you are currently seeking but there are new arrivals every week ...
By
10/02/2008
I don't know if they have your book but I've had good luck with alibris.com. I got some some used books for less than $5 that were over $50 new. My daughter also used it to get some out of print Heartsong books for cheap.
By
10/02/2008
If you've got a little time you can get the book for "free" (sort of). I just checked the paperbackswap.com website and there are several versions of the Ice Princess available. PBS is an on-line book swapping club. If you've got books to trade you can get credit and get the book that way. They also allow you to buy credits and that should still fall under your $10 threshhold.