How much Budget for playermodels

Hello, I'm thinking about creating a job: I want German Police Player Models: 6 different model with only small difference (like with and without hat or Kevlar west). But I don't know how much budget I should select. Is 10-15$ a good value? I'd even be OK if it's just a texture edit from a already existing police playermodel. I think it isn't that hard to edit a texture (I already did it once). Thanks for helping!