Pay through Paypal,skrill or maybe in bitcoin depends on prices
I will tell you what i have told all the potential buyers of this tracker group, i call it group because BTN and PTP are the same owner and very close friends from WCD
So now you think if you buy the account including the email and maybe the same country you live that you are safe?, belive me or not (i not really care) they have a lot other tricks to catch a sold/bought account so the ip or country does not really matter.
I am myself ex dev from a high level tracker so i know all the (shady) tricks they got .
But again it's your money so your risk