3 of the Trolls cost me in the £30 region, the rest £15-20,
If you want a horde of decent metal Trolls, painted nicely, then you can't achieve it without a fairly substantial investment.
You can sometimes pick up cheaper badly painted ones online and strip em, but it's a pain in the rear !
By the time you have stripped the paint, processed and painted the model, you will wish you had just bought one unpainted LOL