These are some places where you can purchase wine, either online or offline. The advantage of online is usually lower prices and better variety, and of course you get delivery to your door.
When purchasing offline, you get to talk to the merchant ( who hopefully knows a little about wine ) and you dont have to wait – your wine is ready to drink as soon as you pay.
Many online wine merchants only deal in wine by the case, since it makes their shipping and stocking simpler, although most will do mixed cases.
For the collectors, there merchants who deal in fine wine collections, although of you plan to drink your collection when it has matured appropriately, you need to make sure that it has been stored correctly.