Re: Meanwhile, 8TB is still above €250
If you've got a crowbar, you can often get USB drives on Amazon for £110-120 (so about €130). Buy two for the €250, open one up to get the drive and use the other as a backup. The 3.5 drives are always SATA inside (no captive USB connectors), never had a problem with one not behaving.
Used to pay the premium for bare drives when it was 10% or so, but they are closer to 75% more expensive now and (unlike the USB ones) never on offer.