It works by providing you with an up to date view of which stores carry the products you are interested in. You list the stores you might visit, the products you like and drinkvine does the work for you. And because drinkvine is always searching it can notify you if a product you are interested in becomes available.
Best of all, drinkvine is free. It was created by a community of enthusiasts. People that not only enjoy good products but want to help others enjoy them too.