How much FAB should I spend to pick up Miles Sanders?

Someone dropped Miles Sanders in my league and I was wondering how much FAB should I spend?

STD - 12 team League.

I have

RBs:
Dalvin Cook
Devonta Freeman
Tevin Coleman
Kalen Ballage
Royce Freeman
Darwin Thompson
Justice Hill
Devin Singletary

I did not draft K or DEF yet, will wait until the 1 week.