Treasure hunting on the Oregon coast

While vacationing on the Oregon coast I plan to make a foray into town for a little junking. I've already made a list of the antique malls and thrift stores. But that's for a rainy day. While the sun is shining I've been doing a little treasure hunting along the beach.
Agates, like those in the picture, roll up on the shore with the waves. I love the idea that it takes hundreds of years for the water to work them out of the matrix and throw them onto the sand like little jewels.