Rio has both RHC and THC. In play. Same with bunions. The THC chips are generally in better shape at both places.
Other RHC Vegas $1 chips include NYNY (rarer than the THC but you can still find some in circulation), Alamo, California Hotel, The D, Fremont, and Longhorn (hot stamp). And if you are willing to go to the state line, Buffalo Bill, Primm Valley and Whiskey Pete all have blue RHC chips.