Do it yourself!
You'll need some new plugs, a gap checking tool, a plug socket and various attachments, and your best swear words on deck because the job is annoying as hell.
You have to take the airbox and washer fluid tank out to get to the plugs IIRC... and it's damn near impossible if the car's still hot.
Check scoobymods.com, I'm sure there's an illustrated step by step writeup on the procedure.
Edit: what Kevin said...