Scribblenauts Unlimited (3DS) is also $9.99. Not sure how long it's been at that price, but I figure it's worth mentioning.
http://www.bestbuy.com/site/Scribblenauts+Unlimited+-+Nintendo+3DS/6260965.p?skuId=6260965&productCategoryId=pcmcat235500050004&id=1218816667608