Vapno:
1) El Cortez offers their coupon book for any on-line booking: Expedia, their website, etc...
2) The 2-day free certificate is for any 2+ day booking (via phone, in person, or any website)
Update: Binions' $10 slot play is only for new members. Bummer.
Thanks Mikeef for the Westion Casuarina Resort fee. I'll look it up.
Heard "M resort" is $25, but haven't double-checked yet.