Personally speaking, I find the listing of calibrators on www.imagingscience.com
to be, uh, um, UNhelpful. A lot of listings are out of date and there is little info about the areas serviced, etc.
I find people will always be able to find ACTIVE (i.e. experienced) calibrators who cover their area using the calibrator finder at www.isfforum.com
- this is a membership site (not for end users, but for calibrators). There's an annual fee that entitles calibrators to list a fair amount of info about the services they offer and links to their own websites. There is no fee or registration for those looking for a calibrator. The membership fee keeps away inactive or "sideline" calibrators so you only get listings for those who really are offering calibration services to individuals... active (and experienced) calibrators.