My "low-rent" guide to Vegas, from numerous TAD's there:
Embassy Suites (right off the Strip) offers a free happy hour with appetizers -and free wireless internet if you sign up for their rewards program.
If you see a "Tix-4-Tonight" office (there is one near the M&M Factory, and one in the Treasure Island Mall), they sell show tickets at discounted prices, as long as you come in the morning of the show. If you are able to pre-plan, I would get tickets there first, or at the ITT office on Nellis AFB.
Toby Keith's "I Love this Bar and Grill" inside Harrah's offers a free beer and half-off cheeseburger meal to all military members.
The casino at Paris is one of the cheaper ones on the Strip - they will have $10 blackjack tables early on Friday and Saturday nights. Planet Hollywood also tends to be cheaper.
Battistas, behind Bally's, is a place offering unlimited wine if you get one of the entrees. It is not great wine, but it is certainly unlimited.
Capriotti's (near Nellis AFB) has a sandwich called "the Bobby" that is the best sandwich in Vegas. I have not ever heard an argument on that.
The Wynn and Encore have amazing decor - it is worth going there just to walk around and/or enjoy the buffet, even though it is out of the way.