I personally have had good luck with out of state dealers on gunbroker. I think it just takes a lot of persistence and communication. It may take a few messages to the seller asking if they'd work with us in ca.
From their point of view, they don't want to ship something into ca, only to find out that the purchaser can't legally dros it, and that person is now demanding a refund. For all the good ones there are ten ignorant ones that will not even consider working with us.
There are good sellers out there that Are Cali educated, You may just have to reassure them that we aren't that screwed up here and that what they are selling isn't completely illegal here.
I like guns.