Need advice in finding a K04 turbocharger

[mobsterlfc]

I have a 2012 Audi A5 2.0 TFSI QUATTRO SPORTBACK B8.5.   It has a few mods already, I now need a K04 turbo upgrade.  Apr do a K04 but its well over 3k.  CTS also have one at a decent price, but they say its not compatible for the UK Audi A5 despite stating it fits my model! 

Any advice on where to buy the k04 turbo at a reasonable price will be much appreciated. 

[audia4b5kev]

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2060353.m570.l1313&_nkw=K04+turbocharger&_sacat=0