The Bay Area (assuming your Bay Area location refers to the SF Bay Area not one of the others around the nation) has several stores that carry trail runners. Here are two that I'm familiar with and know they have a good selection: San Francisco Running Company in Marin has an large selection. Brett, the owner, has won the Quad Dipsea and has some national caliber ultra runners on his staff who are very knowledgeable about running gear. The store is near Tennessee Valley, so it's worth a trip to the area for a trail run or hike whether or not you stop by the store to look for shoes. If you're near the Peninsula, Zombie Runner in Palo Alto has a very large selection. It's especially worth a visit if you like high-quality coffee - they are one of the few running gear companies that has an in-store coffee bar.