BMP,
Whole Foods does wine tastings several times a week, tho I have not been to one. They do have a wine bar that offers tastings of very expensive wines for a smaller fee. For example, if you are looking for an exceptional bottle of wine for your boss and you want to taste it first, they have a pouring system that keeps the tastings fresh. You can sample that $160/bottle wine for twenty bucks at WF.
The bevmo tastings are particularly helpful during their 5cent sales- buy the first and get the second for five cents. There were some suprisingly good wines that were remarkably cheap during the sale. Parducci Chardonay, for example, was super cheap and a decent wine for dinner parties that called for a Chard. Big Yellow Cab is another cheap, yet good wine to serve your friends who are not wine snobs ;-)
BevMo used to offer sparkling wines/champagnes on Sundays for 10 dollars but they just didnt have the crowds to sustain it, so they discontinued that a couple of weekends ago. We'll be at BevMo tonite before a dinner party. Hopefully we'll find something to bring along!
My personal favorite is Frank Family, Napa. I particularly love their Zin. But anything red from them is a treat.