I had some of these at Buoy Beer in Astoria, OR for lunch the other day. They were local -- harvested in Netarts Bay (separates Astoria from Warrenton). They were small and sweet and delicious.
I think Oregon State University is working on (re-)establishing Netarts Bay as an important oyster fishery. If these babies were any indication of their work, they're well on their way. If you're an oyster fan and you see these on the menu, don't pass them up.