Styrofoam Reuse

Napa:
Cartons and Crates, 3250 California Blvd, also accepts large Styrofoam pieces and packaging foam (please call ahead:  224-7447)
Buffalo's Shipping Post, 2471 Solano Ave
All American Mail Center, 1270 Trancas Ave
The UPS Store, 3212 Jefferson St. or 4225 Solano Ave (please no cardboard boxes)

American Canyon:
The UPS Store, 101 W. American Canyon Road
 
Large amounts of clean Styrofoam can be recycled at Timbron International in Stockton, where they recycle it into premium interior moulding products.

Avoid messy and wasteful Styrofoam by packing instead with reused newspaper, cornstarch peanuts, or other earth-friendly methods - and if you're shipping wine, use corrugated or pulped cardboard or check out the biodegradable Original Earth Shipper.