South Pacific Orchids in Gilroy is one of the leading growers of Phalaenopsis orchids and Asian indoor plants in the Bay Area. As such, you'll find their plants sold at many of the Asian grocery store chains such as Ranch 99.
If you're in the Gilroy area, you should check out their retail location. Considering it's a nursery, the selection isn't the greatest, but you can't beat the prices. Last time I was there, there were tons of blooming plants being sold for cheap. Of course, orchids only bloom once a year these plants wouldn't be in bloom for much longer. However, if you have a green thumb and know how to care for orchids so they will bloom every year, this is a great place to load up on cheap plants.