I use The Brewmeister fairly often. They have most equipment and ingredients you will need. They also have a nice selection of brew kits and brew classes.
Me and my buddies are big on morebeer.com it's down in Concord and if your order is $60 or more you get free shipping which ends up being nextday in the sac area
I'm a brewer out in Roseville. Just checked out Gold Country Brew Club which meets in Sacramento the second tuseday of every month. Check out goldcountrybrewers.org. Pretty cool group of people, worth checking out. Brewmeister in folosm is a good supply shop, though I have to admit I buy 90% of my supplies online.
Just checked out Brew Ferment Distill. Looks like a good alternative to online supplies especially if you only need a thing or two. All their product looked reasonably priced.
I've been brewing for a couple years now. GCBA is pretty nice, and the EGBG guys are very fun but it may not be as easy to get into their club as they want to keep it small.
Also plugging BFD, as Tim is a great guy. Was there on his opening day and have been impressed at how much it has improved. The kegging supplies he has are partly my fault.
Work in Sacramento and live in Roseville. Been brewing for about a year and just moved to all grain. I'll have to check out Brew Ferment Distill. I haven't joined a homebrew club. I barely have time to fit in a brew day.
I just started brewing. It's a mead batch. Up here in Grass valley we are blessed with a wonderful brew supply store with people who are very knowledgeable and freely share any info you want or need (sometimes more info than you need). The more I get into this hobby the more people I am finding who do it.