Getting back to a more recent question, Harrah's LV shows rates of 99/99/49 for 23d/24th/25th (and 49 the whole week before and after). Probably one of the better weekend rates you'd see, though there are always extra special deals that come about.

http://www.harrahs.com/our_casinos/las/deals/index.html

Luxor is 119/119/89 based on their promo email.

You can always book something and then cancel later as long as you get a refundable rate. Note that LV custom is to go ahead and bill the first night's charges to your card at time of reservation. This will be refunded if you cancel the reservation.

Edit: Just got another promo email for Luxor that's now 85/85/99 for that weekend.