Some of my faves were:
* http://inka.fm/ - a food-growing sculpture/energy/ecosystem for cities where there isn't much space or locations where fresh water is in short supply
* http://harvest4you.com - my new go-to place for sourcing local high-quality produce for home production of pickles & spirits
* http://poggiotrattoria.com/ - traditional yet nouvelles terrines. downtown Sausalito
Talking about natural fermentation w/:
* http://broccellars.com/ (made from native bacteria from Berkeley, CA. About $35/bottle) available at http://events.sfgate.com/san-francisco-ca/venues/show/8792-william-cross-wine-merchants and
* https://www.bonnydoonvineyard.com (no more red truck)
Originally the "slow food wine expo" was an Italian wine show, which explains the majority of Italian wine vendors. Most of the Italian wines showcased weren't that expensive and the importers told me I should be able to find them in local stores. However, when I looked for the wines online, I couldn't find them on mos of the stores' websites. Maybe you just have to call them and ask or go there to look for yourself?
Some wines around $20/bottle:
* Fratelli Alessandria's verduna pelaverga 2007 - http://www.villaitaliawines.com and http://www.beltramos.com/
* La Crotta di Vegneron's gamay 2007 - http://www.thejugshop.com
* Lini Lambrusco's Rosso sparkling (sweet & tangy, good for parties) - http://www.plumpjackwines.com/plumpjackwines/fillmore.aspx?loc=fillmore
* Marchesi Incisa della Rocchetta's Rosso 2007 - http://www.buyserendipitywines.com/contact.html
* Catherine & Pierre Breton's Borgueil Les Perrières 2004 - http://terroirsf.com/