Sorry for the necro-thread, but I just got my GMRS license over the weekend, and I'm in Riverside as well.
From the map on the main site, seems like Rancho might be a bit far for us, but there's others out there that are within range according to the map. I've got requests in for the following:
City of Hemet 650
Daniel Peak Hemet 550
Redlands 650
Those seem to have the coverage in our area and are non-club (aka: paid). The Redlands and Hemet coverage seems to overlap, but I'm assuming they have different RX/TX and/or offsets?