I am such an idiot. I keep doing it again and again. And every time I solemnly swear and make promises to myself to check. my. frigging. shelves! But - no. It's 75% off coupon galore - so, who cares, go ahead and buy the whole damn store.
And so I did it again. Now I have two copies of Heart of Water and Stone by E.E. Ottoman.
How I wish for a "trade center"! Put a book out with your receipt and trade away! Just saying *sigh*