There are not that many C&R firearms in Las Vegas.
Most gun stores in Vegas do not carry C&R firearms and when they do the pickings are slim & priced high.
When I see C&R firearms in Vegas, it's usually when there's a gun show in town.
The Reno area has more C&R firearms in stock than the Vegas area.
Tell your CA C&R FFL friend to wait until there is a gun show in Vegas and head in for that. The pickings will be slim and priced high, but not as high as CA.
It would be better for him to drive to AZ for C&R firearms.
J&G Sales in Prescott has many well priced C&R firearms in stock.
Regardless of what state he goes to pick up a C&R handgun, remind him that once he returns to CA, per CA law, they have 5 days to send in a
Curio or Relic Handgun Report form with applicable fees ($19 per handgun) to CA DOJ.