need sterio codes for 95 geo metro HELP???

I need the codes for a sterio on a 95 geo metro hb. I bout it from a friend but he got in a trade for laber and the only way I know how to get the code is pay $35 to a dealer. Can any one help. I tolk my wifes Dawoo to the kia dealer and thay gave us the code for that car. I think its stupid for them to charge us a price so high. Some one please help.

My 95 had the factory cassette deck and had not code. I wonder if you have a later deck. Is it a CD player? Can you take a pic of it? You can get codes from some sites on the net but they also charge a fee. I have seen anywhere from $20 to $40. A pic would help alot.