One Dell tape library, tested and working. Library includes one SAS LTO-3 drive and has an empty slot for another. Can take much newer drives, but of course they get more expensive as they get newer. LTO-3 is 400GB uncompressed, which isn't large, but I could imagine some use cases for it. I'll also include 24 LTO-3 tapes (tested some years ago, but likely still working fine) and an external SAS cable. You'll need to provide your own SAS card.
Once upon a time I had the idea for a tape-based high-latency cloud storage service (like, latency of a couple days, to change out tapes.) At the time, I felt it would be possible to provide this for about 1/10th the cost of online reasonable-latency cloud storage, and, you know, there's a market for that. But storage got a lot cheaper, so I'm glad I never got past the small-scale demo stage of the project.
My testing is fairly light -- I verified the library loads tapes and wrote some noise to a couple without error. The drive requested cleaning, so I ran a cleaning tape. (Not included, but you probably don't want it anyway -- I don't remember how many times I've used it.) IBM tape diagnostics looks fine.