This nursery and garden center is a little off the beaten path, but well worth the extra driving time. Their selection is one of the best I have found on the West side and their prices are very competitive.
They carry all types of plants, ground covers, trees and shrubs, as well as seeds, veggies/herbs when in season, and supplies. A nice selection and every time I have been, the plants themselves are healthy looking and nicely trimmed (I have been to some nurseries where plants look unkempt and unwatered!).
They have recently introduced a frequent buyer program, which you should sign up for if you plan on visiting a few times. They do not sell or share your information, so no worries about getting on a bunch of mailing lists.