Where the hell do you buy complete group sets?

i just purchased a frame with a plan to build it up with SRAM Force and I am having a hell of a time finding a place to purchase the complete groupset with the gearing I want. gearing aside there aren’t many places to find the complete sets regardless. I’m in Europe so maybe that’s why? i come to the US or have visitors from there regularly so I could buy it from an online retailer there. i had no idea this would be so hard to source.