Look at what current "off" brands are currently in production by the big name makers. Starrett, B & S, all have had generic or off brands at one time.
Check on e-bay or such for retired machinists or someone selling off Uncle Johns "junk". Good tools can be had for decent prices.
If you do buy the Frankfort Arsenal, Harbor Freight, etc, you have a 50/50 shot of getting a decent set or compete garbage. For 20 bucks it might be worth the gamble. I've thrown two sets in the trash and kept one for a couple years.
Being a machinist, I'll spend cash on good stuff for work. For reloading hobby, not so much.
Whatever you buy, have a way to verify the measurement. Whether the "zero" button gets accidentally pushed on a digital set or the bezel moves on a dial set, you need to be able to zero them each time you take them out of the box.