You can get Dom Perignon, Moet, and probably a good chance you could get Cristal, although I haven't seen it. Since you're looking at buying cases, you might be able to go directly to the source and save a few bucks. In santo domingo you can try almacenes hatuey - I'm pretty sure they have Dom. Or vinos S.A. I can see if I have numbers around. D.P should be around U$140 a bottle, Moet around $100, Cristal - no idea.