I don't have any personal experience, but this place is recommended by a couple of members of the RMCA -
Bird and Exotic Clinic of Seattle
4019 Aurora Ave. N.
Seattle, WA 98103
(206) 783 4538
http://www.birdandexotic.com
There are others listed for Washington, but none for Oak Harbor. The list includes -
Bellingham, Bothell, Chehalis, Kirkland, Lacey, Lake Stevens, Shoreline, Snohomish, Spokane and Woodinville. If any of those are closer to you, let me know and I'll get you the details. (I would give you a link to the site, but I don't know if that's against the Rat Forum's rules or anything)