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Just remember to sort thru the book you want to buy. Get the ones with the LEAST (preferably zero) rewards dollars and use your rewards dollars to buy those. That's because if you use rewards dollars, you can't earn any rewards.
Then buy those with the largest rewards with the gift certificate (or do these first, but since you have $100 of books and $120 to play with, I'd reserve any GC credit for future purchases). This will result in more rewards and you should still have some credit left over.
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