Go to
www.advantageplayer.com/las/vegas/ and click on the appropriate link on the left of the page. Also, if available, the American Casino Guide has some free play coupons for new signees-- 4Qs, Binions, Palazzo, and El Cortez (all members) for example. If you post on the "coupon trade" thread here, someone might pass them to you for free, since it is so late in the year. In July Wynn was offering free play for new signees, no coupon needed. Golden Nugget has been offering $10 in free play for some time assuming they haven't discontinued it.
And like I mentioned advantageplayer will have the most up to date list.
Have fun.