I have a key that I need a duplicate for..?

I have a master key that goes to an office buliding. And I have taken it to 4 places now to have a it coppied... However they all said that the key is too thick for the machine they have and they don't have blank to match.. also i have a bad rep with out local locksmith. Does anyone know of a place I could send the key to be coppied?!?!! Thanks