And on the above...I'm not making ( and very rarely ever do ) any recommendations...just those were a couple of places I am aware of who sell/install those particular products !
Although would have no issue with recommending any of the 3 ecu's mentioned for a budget build ( ie Link, DTA or Emerald in no particular order )
There are of course even cheaper out there and there are more expensive. But the most important bit is the support of someone who can actually make it work for you.