WOULD LIKE MORE INFO PLEASE??

I have been wanting to get a bigger cage for my rats and i think one of those 4 level ferret houses would be wonderfull but havvnt the faintist idea how to rat proof it i read about useing wire mesh in a successful shopping trip for the ratty girls and was hopeing some one could give me more details on how this can be done and where to get wire mesh there is no home depot for about 90 miles here and i dont have a car
thanks