Most of our wine is purchased at the brick & mortar of the store called "Beverages & More!" a.k.a. BevMo.
They periodically have a 5-cent wine sale where you buy one bottle, get the second for 5 cents. What most people don't know is that if you're really unhappy with that $30 bottle you bought to get a 2nd for 5 cents, you can bring back the unopened bottle and the opened bottle and get back your $30, having only lost 5 cents.
Needless to say, it's hard not to walk out of there with at least 12 bottles during that sale. Add to that the fact that Saturday wine tastings are 5 cents during that sale (which lasts for weeks), and you've got yourself a deal homeslice.
EDIT - San Jose, CA