Replacement Radio

I am sure this topic has been discussed before but I am hoping someone might know where I can find a radio for my 72 duster. I don't want to cut the dash and I want to use the original face plate. I figured there has to be a radio that I can buy that will fit the original hole with out the cost breaking the bank. I know there is guys that will convert my old radio into a modern one but they want 5 or $600. Has anyone found one?