We do prebuy inspections in our shop at O85 in Redding, CA, and also on the road.  If you need a prebuy inspection done on site at the aircraft location, we are mobile and can travel.  We do very thorough inspections of the airframe, engine (including borescope), and logbook records.  We will provide you with a professional inspection report at the end that you can use to negotiate with and make a good decision on your new aircraft purchase.  The money saved through negotiation after a thorough prebuy inspection is usually more than the cost of the prebuy itself!