Not sure what sites you're checking, but I've never paid more than $60 a night for a room on the strip. Check harrahs.com there are lots of specials there. Some rooms for $29.
If you are only looking at Bellagio, Venetian, etc then you are going to pay more.
Places I have stayed include
Cesar's palace
Ballys
Paris
Flamingo
Harrahs
Treasure island
You can also check booking.com or hotels.com for some good deals.
I prefer staying in old Vegas and going to visit the strip. 4951