technology

Assuming you mean hard drives not SSDs: almost nothing. If prices scaled perfectly linearly and all things were equal at these prices per TB it would be worth about $6.

But all things are not equal. Your drives are assuredly much older than these drives, probably more worn and the power cost of running it compared to capacity and use of limited SATA connectors would not be worth it for any kind of hot storage which lowers its value. The only way to sell them would be in a lot of at least 8, ideally more and you'd probably be lucky to get $3/drive if you can prove the SMART data on all of them is good and they work. Also if they're not enterprise drives like these are knock that down a bit more.

Buying drives that small and old is little better than gambling and playing the odds so you have to buy an awful lot of them awfully cheap to deal with the fact you're assuredly getting some bad eggs. You also have to figure in the hassle for the buyer of managing say backing up their 10TB data-set to 40 drives like this including plugging them in, unplugging, regular testing every year and storing them somewhere safe as well as dealing with failures and documenting what is on each drive. Most people conclude it isn't worth the hassle though there's enough desperate people out there now that some might bite.

250GB SSDs on the other hand assuming they're not in a failing state are still worth some change as you can use them to install an OS on various homelab devices like a server, firewall, etc.