This isn’t entirely Las Vegas based, but I know a lot of you play myVEGAS and you could use this in Las Vegas if you wanted.  MyVEGAS is now offer Fandango movie e-gift cards in $15, $30 and $50 amounts. The Rewards cost 15,000LPs, 30,000LPs and 50,000LPs respectively.  You can use the gift cards to purchase tickets for many Las Vegas cinemas in addition to your local theaters through Fandango.  The Palms, Orleans, Green Valley Ranch, Sams Town and Showcase Mall movie theaters are just a few of Las Vegas theaters where you could use the gift cards.

They have the standard limitation of 1 Reward per myVEGAS account and need to be redeemed within 90 days of purchase, but do not count towards the MGM 3 in 30 Days limitation.

Tickets must be purchased through Fandango.
To redeem your Reward, go to www.fandango.com/. Selected your show, time and theater. When you check out, click the Use Fandango Gift Card button, enter your code and click apply. You can visit the Fandango myVEGAS page for additional details.

UPDATE:
This was a limited time promotion and it has expired.