I used East Coast Mustangs, the fee was $3000 (It was about $2700, but by the time the car came, it went up to $3k)
I used a guy over there to look at the car for me, His report was a total waste of a few international phonecalls, and $100US.
He told me (among other things) in his report that the dash was gloss black, (instead of the proper matt black) but didn't notice the rh 1/4 vent window was screwed shut with a big bracket, or the total lack of any wiper/washer systems or wiring. Or that the hood was a lift off item, not on hinges. I could go on, but I won't.
The same guy charged me $200US to do the purchase on the car. The car was dropped off to him, he did not ask me for a list of included parts, and did not check to see if the car was complete or not:_ All of the small trim parts were missing (nearly $1500au worth)
Peter was great, gave me a reasonable price on the stuff I needed to buy. Will deal with him again if the need arises, but he should get someone else doing the pre purchase inspections, as it tarnishes his name.