http://www.butterflybreeders.org/public ... demap.html
Map of the continental divide. You can purchase butterflies from breeders who live on the western side.
It isn't cheap. There is overnight shipping. If you choose to do this, make sure you test the butterflies for OE before you release them. http://www.monarchparasites.org/
Project Monarch Health
There are 2 CA breeders on this list:www.forbutterflies.org
Association for Butterflieshttp://www.butterflies4sale.org/
Any one on the west coast can ship you butterflies. You just have to contact a breeder and ask them if they have Monarchs.
This list has CA, OR, UT, and CO (depending on where they are located according to the map):www.butterflybreeders.org
International Butterfly Breeders Associationhttp://www.butterflybreeders.org/public ... to_buy.cfm
Where to Buy Butterflies