Just for clarification for Jamison and whoever else might be lurking in this post, Ray lives in Carpinteria where Seaside Oil Company was based in the hey day of Santa Barbara County Oil Production. Those of us near the coastline have an affinity for Seaside because it was our local brand. I live on the other side of the hill from Ray, also in Santa Barbara County closer to what was formerly Union Oil company territory.
There were a number of Seaside stations dotting the coast highway in this area including a bulk oil plant in the town of Buellton just a couple of miles from me in Solvang.
I collect Seaside Oil Company photos primarily because of the sign prices that Ray quoted above!
Here's another photo of the Solvang Garage, also a Seaside dealer.
I've seen a lot of hand painted and cardboard Seaside signs, most of which did not hold up well over time. Because they were a smaller company I suspect this was a cost saving measure, especially for stations in small towns that sold multiple brands of gasoline.