@boobies - I'm not sure if it's just where I live, but every gas station, supermarket, and basically any place with a cooler, has at least twice as many varieties of beer than any other beverage.
270mg is a 1st plat dose for most people's weight. It's a good like, first-time dose, but you're not going to get much in the way of CEV's, mindfuck, or much of anything. I always try to shoot for 300+, since that's where you start getting into second plat territory, and that's more fun, at least in my opinion. I usually dose 400mg, and smoke a couple bowls, that gets me tripping nicely. Just generally speaking from my experience and everyone I've talked to, don't be that worried about overshooting your dose mark - If you're aiming for a mid second plat, and you accidentally take an extra 50-100mg or something, it's probably not going to shoot you immediately into something you can't handle. The threshold points for most people tend to be around the 300-400mg mark from 1-2, and 600-700 from 2-3, so really you're probably not going to have an accidental third plateau on your hands.
They sell these Zicam Cough Max spraybottle things that are 392mg DXM in half an ounce of fluid, that's a good way to get your dosing done, although I am quite convinced that the spray is literally the worst tasting fluid you could possibly create. I have never, ever tasted something that made me feel as if I had I had dunked my throat in a vat of industrial chemicals more than that stuff does. But shit hits you in like, 20-30 minutes, so there's that going for it, hahah.