What craigslist are you using? There is a new section for the Tri-Cities. If you can't find a car there, you may have to check the Yakima or even the Seattle craigslist listings.
Just glancing at the Tri Cities craigslist, I saw this one in Sunnyside:
http://kpr.craigslist.org/car/331748565.html
Sounds pretty good for $350.
If you're from Alaska, obviously you're not going to encouter "bitter cold" temperatures like that in the Tri Cities. The winter I lived in Richland, it did get a hair below zero for a spell but that's unusual. What I though made it uncomfortable were the times the wind blew and it was in the teens ...the wind chill factor made it seem much colder.
Thanks.
--'rocco