This is the first time hearing the term "kilobucks". I love it (and am stealing it for future conversations).
Since the switch to euro, I think the most commonly accepted value of one "brique" is (unofficially) 10 000 €, but the uncertainty makes it basically useless.
I can't recall I've heard "brique" used since the switch to € but it might just be my local bubble
(The only person I know that still used «briques» in these decades were my grand parents born in the 1920th)