The Las Vegas Monorail is running a buy one get one 50% off sale on One Day passes.
The promo code is: cybermonday2012
The sale ends at Midnight on Tuesday, November 27th.
One Day passes are good for 1 year from the time of purchase and let you ride the Monorail for 24 hours from the time you first use them.
Here is the link: https://tickets.lvmonorail.com/cybermonday2012/