Paver sites
http://www.belgard.com/products/pavers
http://www.calstone.com/index_residential.php?site=2
http://www.stepstoneinc.com/ - -great large scale narrow modular pavers
When you find one you like, you should call them to find out the closest distributor.
Many rockeries carry different brands.
Rockeries
Peninsula Building Material http://www.pbm1923.com/
Granite Rock http://www.graniterock.com/
Stamped concrete
Clicking on Decorative Products will give you several different textures, patterns, and colors to view.
Plants
http://www.sanjose.watersavingplants.com/
http://www.contracosta.watersavingplants.com/
Fun places
Pottery Planet http://www.potteryplanetlosgatos.com/
Ohmega Salvage http://www.ohmegasalvage.com/
Nurseries
Yamagami’s Nursery http://www.yamagamisnursery.com/
Central Wholesale Nursery http://www.centralwholesalenursery.com/
Alden Lane Nursery http://www.aldenlane.com/