This external drive seemingly has a listing for 40$ from Dell but going to the actual site it appears to have a normal price? Edit: Gone now but you can see the dip in the price history; weird.
The same thing is happening with the 860 Evo 500 GB. Listed as $25 but Dell has normal price
If it was ever sold at that price, it didn't last long.
On the other hand, newegg was selling 6T external (shingled Seagates) for $80 (I had already bought one at that price from Target. I suspect most Targets have sold out at that price), so it isn't quite as unlikely as seen at first glance.
The newegg thing claimed to be a blitz deal "subscriber only, one day only" deal...
check target in store. their clearing out some of them. i got one for the same price in store.
Even weirder, PCPP now has it at $229.99, but it's actually $179.99.