Bfast diff, and others?

[mk2 polo power]

Hi,
I’ve got a mad rat, and I’m interested in upgrading the diff, in particular getting hold of the Bfast diff kit.
I’m based in uk and was wondering who is the best supplier for the Bfast diff kit?
On previous threads people say it is good value for money, yet it seemed quite a few $$ @ $28… from America…
Any advice much appreciated.
Do people just get it from America?

Joe