Hello,
I own a copy of Fallout: New Vegas, that I bought from British Amazon (distributor - Bethesda/Zenimax, game version - UK), not from my local distributor Cenega Poland (I live in Poland).
But - I can only buy:

Fallout New Vegas: Old World Blues
Fallout New Vegas: Dead Money
Fallout New Vegas: Honest Hearts

I cannot buy:
Fallout New Vegas: Lonesome Road
Fallout New Vegas: Gun Runners' Arsenal
Fallout New Vegas: Courier’s Stash

Why? Why I cannot buy expansions to product that I own?
I got a product, that my local distributor (Cenega) is not supporting, because I bought it in UK. And I cannot buy the DLCs that are available in UK from Bethesda... what is going on? I got to fly with my laptop to UK, to buy 3 DLCs to bypass region block?! I got a UK version, not the Polish one, so I want to buy UK expansions.
Greetings,