These recycling center almost always have a large dumpster from one of the large rendering companies that they dump fryer oil in. I have checked several around my neck of the woods.

I should have given a little more info on this as well. I live in the Lynnwood area and commute to Redmond for work. Anywhere in that area would be ideal for picking up oil. As for quality of oil, there is good oil and bad oil. I'm looking for oil that is amber, golden, or brown in color. It's best if you can see your refection in the oil. Oils should be in a liquid state not solidified. All other oils can be made into biodiesel but there is a tremendous amount of extra work involved.