Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Recertified Hard Drive
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Just under $15 a TB but they're refurbished. The new drives on other places are going for around $440 or so, with other models and brands back up to $500.
Not the absolute best deal but so far I've only seen a 20TB hard drive for just under $400. First time I've seen a 20TB refurbished option, DOM on label shows from last month, just 30 days ago too! Not sure why something would be refurbished not even a month later?
There's also a refurb 16TB option which is a much better deal but if you're like me and can only connect 8 drives then this is the cheapest option for the most capacity in an 8 bay.