eBay does have them but the V1s are overpriced and V2 not so often. I would ensure you buy the V2 which comes in 3VIN, 10 VIN and Unlimited VIN forms. There is a second hand V2 for sale, 3 VIN with 1 VIN used for £145 on Audi Sport.
https://www.audi-sport.net/xf/thread.../#post-3611139
Personally, just buy a new one for £200ish. It will be registered to you and easier to upgrade it should you need to.
Or, join the VCDS group on facebook, they usually come up on there