For anyone with insurance that covers most of the cost of things like x-rays, CT scans, MRIs, and ultrasounds, the Olympic Medical Center is the most convenient option. Unfortunately, most of us have high deductible plans and have to pay for most of our testing out of pocket (even though we pay unfairly high monthly premiums for that coverage). A much more transparent and affordable option is InHealth Imaging. They have several locations, their closest being Poulsbo. While the drive may be less convenient, the service is very personal and professional. The radiologist actually meets personally with most patients after their imaging study, and their prices cannot be beat (and are not hidden). They negotiate lower prices with insurance AND they offer a 40% discount for anyone paying out of pocket!
For example, a typical 2-view chest x-ray at a typical hospital would cost a little over $200 (and maybe less depending on your insurance plan). The same x-ray at InHealth Imaging would be $104 if billing insurance and only $65 if you decided to just pay for the whole thing out of pocket!