Every once in a while, it's possible to get lucky on ebay. I got my i7-3770K that way, $50 right after the i7 4770k was released. The owner had a misprint in the title, so wasn't searched by looking up the i7-3770K so got no hits. $50 start bid, and I was the only bidder.
But that's a fluke.
Don't know how you'd get an actual gtx1070 for that price, unless that was the starting price and nobody else bid on it. Might want to re-read the entire post and description, used is one thing, used (parts) is something else entirely.