You looking for engine, or whole ski?
There are a few 750sx' on our local CL, one in Poulsbo for $1750 with a Factory Wet pipe (worth $500+). Plus at least 4 SXR 800s.
There is a Northwest Jet Sport Assoc on Facebook, 173 members, plus the NW section of PWCT. There's only a handful of NW guys on here regularly, so those other 2 places are a better for sourcing local parts and help.