I highly doubt these were bought for 1$ USD , even Geofmen-250 aren't that cheap.. be careful with buying anything out of paki, its very rouge now and 90% scammers.. there was a short duration some years back where it was good with a few trusted sources, but they to went rouge, and selective scammed people, and most collectors for funds were being declined because most were on the watch list.. yeah, just what you need!
I have been in the position on many occasions where I purchased amps like that to use in that region of the world. $1 to $1.50 per amp was the market value. Of course, that was there. I would expect to pay a premium in more civilized countries
If you pay attention to the reps in this thread, the guys in th e know, they know that price sounds sketchy. So yeah, anything I'm buying dirt cheap like that I'd be careful. More often than not, you get what you pay for