I would try and get it for free if you can and depending where you live you have choice from alternative pro car detailers. Dont forget to compare like for like, the autoglym from Audi includes inside and out protection.
Also if you bother getting the paint protection you need to commit yourself to looking after it, even the best paint protection wont last if you dont look after it with complimentary products.
Get on ebay you can buy the polish pads and do it your self. Its not hard atall. The polish is inside the sponge so all you have todo is put a slit in the middel with a sharp knife apply an even coat on the car and then buff off with a micro fiber cloth. http://cgi.ebay.co.uk/SUPAGARD-5-X-100- ... 3a6695f063