as far as I can tell.

If you're willing to TOFTT, it helps to post reviews of the various providers off CL.  In this case, it doesn't seem like anyone has done that here (yet... hint hint).

In any case, one of the well reviewed indies would spent an entire hour for a slightly higher rate.  Besides booking in advance and making her feel comfortable (pass her screening/verification process), it has the highest probability of being a winning bet.

But hey, this is Vegas, if you want to wait til the last minute, look through some CL ads, place your bet on someone with little info out there, you might end up hitting the jackpot.  Of course, odds tend to be against you so let us know how it turns out.

Bob