There are many plants sales events. I only posted the one held locally. To attend on another day, visit http://www.iegardenfriendly.com.
The following is from http://www.iegardenfriendly.com/events.asp?event=165:
Water-wise Plant Sale
4/26/2014 , 8:00 a.m. to noon
The Home Depot
3400 W. Florida Ave.
Hemet, CA 92545
Parking lot sale with special pricing on water-wise plants and related products.
Hosted by The Inland Empire family of water agencies, the Home Depot, and its vendors.
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The Inland Empire Garden Friendly program was developed by the four major water suppliers of western Riverside and San Bernardino counties in California with cooperation from a university institute, conservation district and local botanic garden.
They offer many resources on their website including events such as plant sales and workshops. For more information, visit http://www.iegardenfriendly.com.