You didn't specify a budget, but here are a couple in your area on Seattle Craigslist. Normally you can talk people/dealers way down on an eco-car when gas prices are this low, so it's a good time to buy one. You'd have to pull a Carfax on them to check their histories.
First one looks like it might actually come with a spare parts car, not sure about it being driven commercially though:
2000 Honda Insight
Another one:
2000 Honda Insight Hybrid, clean CarFAX, In-House finance w/no credit!
And another:
2000 Honda Insight Hatchback
And from the surrounding area:
2000 Honda Insight