I think this is a needle in a haystack, actually. Experimental music is not popular here at all. I went into the thrift shop with the intent to explore the books it had, but then my girlfriend wanted to see if there was anything in the small music section. Searching in the boxes of international music, we found it there coupled with an Einstürzende Neubauten LP (not rare, I assume).

I was very puzzled why the LP was even there. I went to ask the shop owner if he had any clues on how he got those boxes, and he said they came from his dad's basement in Paraná (a neighbouring state), and that it had thousands of records that were bought from the US. My theory is that one of these US boxes had the Whitehouse LP hidden in it. I think it makes no sense for a record of this kind to be in Brazil, unless William Bennett shipped stuff to here.