Sadly, Treasure Hunt is going out (gone by now?), So the nearest shops are about 45 minutes away.
I have just started quilting this year and I find myself driving to Ventura (Quilt Ventura, located next to a yarn and bead store as well), Thousand Oaks (Cotton & Chocolate) and Buellton (Creation Station).
These 3 are great and worth the drive. Then there are about 8 in the Santa maria/SLO/Paso Robles areas that are worth a weekend trip :)