Those are almost certainly 8 to 32GB drives that are modified to report a higher capacity. They are scams that hope your return window expires before you try to load them up with a lot of data. Nobody can profitably manufacture flash drives for less than the wholesale price of the flash chips.
There's no almost about it. They are all scams 100%. The most popular are SD cards with a USB adapter fitted in various housings. The internal adapter or SD cards are modified to do various things like report much larger sizes, allow phantom writes, or even install malware. They can also potentially burn your house down.
Those are almost certainly 8 to 32GB drives that are modified to report a higher capacity. They are scams that hope your return window expires before you try to load them up with a lot of data. Nobody can profitably manufacture flash drives for less than the wholesale price of the flash chips.