Fenris will make moulds and cast resin minis. Try Ian he might be able to help. Or Griffin miniatures, Si at pig iron uses them, my halo custom helmets were done there, very nice.
The deal that roll forged used to do though was to cast the figures for nothing, then split the profits 40/40/20 (with 20% covering the casting costs), all the other options either involve selling the sculpt (assuming anyone wants to buy it) or paying to have casting done, which I don't want to do, i've done that a couple of times with some space dwarves and never managed to make my money back even let alone some pocket money
.