maybe there is somewhere a little further out of town that you could take a little trip to every couple of months or so, and stock up on treats. bigger cities, bigger stores, or areas with more asian, african, or jewish populations are pretty likely to have dairy free options. lots of stuff is shelf stable of freezable.
california is probably pretty big (i have amazingly bad geography skills but i'll assume it is), but there has got to be a wholefoods or trader joes or something round there! maybe someone in the california forum has tips on stores.
also, don't be afraid to ask stores near you to get things in. big chains can order loads of different lines, and will if the demand is there. little stores too- as they value the personal relationship with customers. lots of companies and suppliers they already use will also carry vegan lines- if you smile sweetly and bug them, stuff might show up.