All this month: 1000 points ($1000 coin-in) gets you $10 free play; first half of the month, EI, second half of the month, Rainbow. Good every day except Sunday at Rainbow and Tuesday at EI--because on those days, it only takes 700 points to get $10, and you can do that twice in the same day.
Both places have 100% payback VP (and a bunch of games over 99.5%) at denoms from .01 to $3 a hand. Not to mention several daily big point multipliers, all sorts of great food specials, free stuff just for having a pulse, etc.
I'm kind of a broken record about these places, but with the rest of Vegas going Gouge City, they seem more attractive every day.