The Excalibur has soft $1-3 and $2-6 spread limit games (on any betting round you can determine how much to bet). Next door Luxor has a weak $2/4 limit. MGM's $3/6 and $4/8 games also are fishy.
At the other end of the Strip, Sahara has a decent poker rate (between $40 and $60 a night for 3 hours of play). Call poker room manager Fred Masters at 702-737-2317 during regular weekday Pacific Time business hours. The casino/hotel is at the bottom end of the Strip but on the monorail. It has fishy $2/4 limit and NL $1-2 games. Comps are a little weak, at $4 for 4 hours of play.
I've thought the former Horseshoe downtown (now Binion's) has pretty weak $2/4 and $3/6 games. You can get an $8 comp for 4 hours of play.