Modern Moulding

Does anyone know where in the Bay Area I can get pre-painted (white) mid-century modern style doorway, baseboard and/or ceiling moulding? You know, it's squared at the edge, maybe 1-3/4" or 2" in height. Most home centers have ranch style, colonial, crown, beveled, tapered, etc. but I can't seem to find the squared kind that's 2" tall or less.

Of course, I could go to a lumber yard, cut, sand, prime, paint, etc., but if I could find the ready-made stuff, it would save me a ton of time. Thanks.