I've looked in Whole Foods and Fresh-whatever-their-name-is,
in the starch section next to the arrowroot,
in the specialty flours next to the rice,
in theBob's Red Mill display,
and in the "International"/Latin/Caribbean/African sections.
I don't care if you call it fufu or manioc or cassava or yuca, label it in Spanish or Portuguese or Swahili, and I'll happily drive to anywhere in town to get it -- I just need a good 3 lbs!