So, I'll be honest, most of the funds are going to go to spriters who will make most of, if not all the graphical things.
As such, each mech will only cost 20-40, codewise. I do have several categories I'd like to keep them in (for balancing reasons)
S1 Mech: 1x1 tile sized mechs, mainly for boarding and such. Think exosuits.
S2 Mech: 2x2 tile sized mechs, mainly for dogfighting and such. Think space fighters.
S3 Mech: 3x3 tile sized mechs, mainly for bombing ships and such. Think space bombers.
For SPRITES, it might cost 40-80 dollars, as I'd need sprites for in construction as well, but you might be able to source a good spriter or provide said sprites.