Dear Mike,
A real pitty MBGTC.de only ships within the EU; they currently have a great set on offer:
Mercedes-Benz Gebrauchtteile-Center | Innenausstattung | online kaufen
If you like this set, and if it falls into your definition of "affordable" you might consider dropping them an e-mail kindly asking whether they might ship to CA for once.
Best,
Arjen.