Just to keep things moving here, I checked Priceline.com for r/t flights from NYC to Vegas and randomly put in the first weekend in August, although unless there is some kind of convention, I'm guessing it's pretty much be accurate for the summer. The total r/t nonstop flight was Approx. $335 (including tax), which isn't bad really. Don't know if airlines give group discounts or not.
Anyway, FYI. ;\)

TIS


"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK

"War is over, if you want it" - John Lennon