The LVH (formerly the Las Vegas Hilton) is running a really good Cyber Monday offer for 10 nights for a total of $199 (plus taxes and $18/nt resort fee). The offer is actually good all week. If you go to their website, they show a $299 rate for the offer, but as long as you use the “Cyber Monday $199 Package” code when you call, you should be able to get the $199 rate. The offer needs to be booked by midnight December 8th, 2013 and is good for stays through September 30, 2014. There are unspecified blackout dates.
The 10 nights do not have to be consecutive. You can break them up however you want. For example, you could use 3 nights for one trip, 5 nights for another and 2 nights for another. You would need to make the reservations for all of those stays at the same time, though.
The LVH is a reliable, but basic hotel with a 3.5-star TripAdvisor rating. It is great for business trips since it is next to the Las Vegas Convention Center. It is off-Strip, but it has a Monorail station, so getting to the Strip is very easy.
Here is the description from the emailed offer.