Relativity earns out!
Of course, my books from big publishers like Tor earn royalties beyond their advances, but when dealing with small presses, royalties are rarely seen; the advance, such as it is, is usually all that ever materializes.
So it was to my astonishment and delight that I just received a nice cheque from ISFiC Press, publishers of my Aurora Award-winning hardcover collection Relativity: Essays and Stories.
This book was done in conjunction with me being Guest of Honor at Windycon in Chicago in 2004, and was ISFiC Press's first book.
I don't sell this one through my eBay store, but you can get it from ISFiC Press, Amazon.com, or Toronto's Bakka-Phoenix Books (where it's been a bestseller).