Of course you can buy all kinds of St Emilion wine. Thhis is after all wine country. We happened upon a souvenir shop that sold knick knacks and art work by a blogger whose work I follow on my blog list. http://les-calepins-de-lapin.blogspot.com/ I bought one of his art book and posted a comment on his blog that I was in St Emilion and bought one of art books.
Besides wine there are other things to buy, the macarons that the region is famous for among other things.