Vegas wine

I have a drinking problem. I don't drink enough! So, I'm throwing out a request for good wine plays in Vegas. I'm a big wine drinker, and I like to drink good wine, which is usually expensive. Does any casino have really good wine for comp? I notice a big problem with casino wine is low turnover, so the wine sits in an open bottle between servings and gets rancid. Do some of the big liquor stores have tastings? Any good wine bars with reasonable prices or happy hour specials?

Thanks!

Lee's Discount Liquor has a few stores that might take you half an hour to visit considering the free samples. Their annual show tickets are said to be well worth it but be sure to get a "DUI Avoidance Room" for the night.

M resort might be out of your way but seems to be generous with wine and I'm told good wine.