Those are very old.

The current standard is LTO-8, with 12 real TB of data per cartridge and it has the lowest cost per TB stored.

However, the LTO-8 drives are very expensive, e.g. between $2000 and $4000.

Or, as anyone who's spent the last year patiently waiting in line at a Microcenter has observed, the price of a gaming enthusiast's graphics card.

Used drives. I would be worried about how clean the heads are and whether they are worn down and need to be replaced.