If you need to re-stock your inventory of jumper wires, I found a good deal on 3 x 40P 20cm Dupont Wire Jumper Cable 2.54 1P-1P Male-Male/Female-Female/Female-Male for $7.64.
That’s 40 of each wire type. I don’t know about anyone else, but that’s about the best deal I’ve seen without having to order from China on eBay.