manufacture

I am making my own 3x3, I have all the designs, logo name of cube etc, but I can't find a manufacture that can put in the system I have in their cube, 99.99% of the manufacturers have premade cube just for you to make custom box and logo. Any manufacture suggestions that is cheap, and you have...

Can anyone suggest a brand, or give me a link to good modelling putty, like Apoxie Sculpt?