VW mk6 golf key fob

[GJG02]

Can anyone help with a solution to buying a replacement keyfob from the likes of eBay & having it reprogrammed to my 2009 mk6 gti golf ???? Or is this a "stealer " only option?? Have had to replace a lost key previously on a mk4 golf years back at a cost of over £200 from VW. As I Only have one key with car I recently purchased & would like a spare for emergencies but not at ransom money. Any response appreciated..