LV Advisor Coupon Book has Great Deals
If you join Anthony Curtis' Las Vegas Advisor online membership ($35 for a year) you get a coupon book that has lots of 2 for 1 buffets and other deals. We drove to pick it up at their offices just off Tropicana. If you go to the LV Advisor web site, you can see what is in the coupon book before you go, and before you purchase. I have been to LV three times this year, and have gotten a lot of use out of it.
I too love the buffet at the M Resort, and the buffet at the Wynn. Neither are in the LVA coupon book, but they are great buffets!
Also, I subscribe to Restaurants.com e-mail notifications. They often have 80% off their gift certificates, and there are lots of LV strip area restaurants. We got a $25 gift certificate for House of Blues for $2. With the cover and our meal (including a drink), it was $30 for two including tip (using the certificate). Great deal and great music!
We also love Tix4Tonite (ticket desk just inside Bill's if you are staying at Flamingo; outside Peppermill if you are staying at the Strip property). If you aren't totally fixed on a particular show, you can get great deals!