Delta Saloon still has 1 $10 machine
Reno Airport still has at least the 2 $10 machines on the lower level (other 2 machines are in locations you have to have a ticket to get to. Haven't flown in a couple months so can't confirm, but can assume the other 2 are still there)
Sands Regency still has 1 $10 machine
Sierra Sid's still has 2 $10 machines (some $200 still left)
Silver Legacy still has one $10 machine left