I like the 5mm ones from HF. They are thin enough that I don’t feel like I lose any dexterity and feel like they don’t get as hot and sweaty as the 9mil ones.
They definitely aren’t very durable, and I go through them at a decent clip, but they keep my hands pretty clean. At $6/box they are...
If that’s a legit international tool box, 650 is a steal.
I’ve seen screwdriver sets sell for over 1k.
Socket sets (like 12 pc ones) can sell for hundreds.
Old farmers collect this stuff and have time and money in the winter to do it.