The main frequencies I think are 132.30, 124.625 and 124.20
The last time I checked reception in the Las Vegas area you could hear the controllers on the following ZLA frequencies ...
132.625 - ZLA34, FL240 and above, overhead (SoCal departures)
127.350 - ZLA36, FL340 and above, south (SoCal arrivals)
134.650 - ZLA06, FL230 and below, southwest
124.850 - ZLA08, FL230 and below, southeast
Other ZLA frequencies in the area but with no controller reception ...
128.075 - ZLA35, FL240 to FL330, south (under ZLA36)
118.025 - ZLA53, FL240 to FL330, western half of ZLA35 when required, rarely used
124.625 - ZLA16, High/Low (surface and above), north (controller reception intermittent?)
124.200 - ZLA07, FL230 and below, northeast
135.550 - ZLA32, FL340 and above, east
135.250 - ZLA33, FL240 to FL330, east
A dedicated ZLA feed in the LAS area would be great (there used to be one). I can donate funds to help out.