The prices for most large-format FR drives from East Digital have heavily fluctuated in the past month. So please be aware of the market prices on those drives before making a decision.
Seems a new batch of FR 16TB Seagate SATA drives are back in stock with an okay-ish per-TB price, at $20/TB. If you need drives now and can deal with the 16TB size, this can be a acceptable choice. All other drives >16TB are at least $22/TB, and >18TB drives are >$25/TB (risen from $19/TB, ouch).
For used/pulled drives, HC550 18TB is the only one in stock at $323 ($17.94/TB).
Read previous ED deals page on comparison between new, shucked, FR and pull/used drives.
Note: you may be charged foreign transaction fees - consider use a no-fee credit card. Tested with Amex, no fees charged (as Amex charge 3% currency conversion, not foreign transaction fees)
Also you may want to know that >20TB Seagate FR drives may be on a new model numbers instead of just a refurbished drive on its original model number:
https://www.seagate.com/content/dam/seagate/assets/support/i…
Already seeing these re-numbered drives sold by ServerPartDeals.