607.3 version with CAN works ok, ~30usd in China
I've been trying to find a cheap VAGCOM to sell. There has always been VAGCOM cables on ebay for under $20. And it is true that you can download a free version of RossTech. But the free version won't let you make any timing or fuel quantity adjustments to your ECU. You have to pay $300 for that. I would like to see Vagcom devices under $100, but only time will tell.