I got mine new from one of the companies on here, they quite often give you their discount codes. Got my DA6, storage bag, couple of bottles of polish and two polishing pads (and postage) for £100. Also have a private sales section:
Not too sure yet about paint.. I clean alot of vehicle upholstery and carpets and figured I should start looking more into detailing as well, could be a good option but have yet to dive in.
Cliff - https://www.carpetcleaningmedicinehat.com/
Our car goes through layers of paints so I don't it will damaged easily. I ordered a Bosch polisher. I will have to ask assistance from a friend who works at window cleaning service who knows about car polishing.