Your first best bet is hooking up with a horny fellow tourist, if you've got game.
If you're looking for SPs, they CAN get ridiculously pricey.
Do your research on lasvegas.backpage.com (Craigslist erotic section is dead in the U.S. now).
Also, some free reviews are on lvfever.com. You'll get an idea of how expensive things can get, and possibly find a gem or two.
Checking out the casino girls (sp's) at the hotel bars and walkways is also interesting. (Keep in mind that street prostitution is illegal, though)
Finally, if you're into looking and WILD lap dances, check out the strip clubs. My recommendation: Deja Vu and Little Darlings (sister clubs) and possibly Talk of the Town. These are juice bars with natural young dancers. Full nudity and contact dances. Good show in gyno row, with some doing tricks with your dollar tips. Moderately priced admission and lap dances.
http://www.vegas-after-dark.com/main/index.php
Report back. I'd like to go in August. : )