http://www.rewardsdb.com/ is a really good resouce for questions like this, although it seems to incorrectly indicate that AAdvantage E-Shopping has PotteryBarn. Perhaps it was recently removed?

Anyway, if youve got a week or so, your best bet for miles is to buy Pottery Barn gift certificates through GiftCertificates.com via AAdvantage E-Shopping, which should net you 2 miles per dollar.