old keys

has anyone run into the problem of hardware stores and even some lock stores do not having the old style key blanks?

I went to a local lock smith place and the girl there wanted to use a GM key blank to copy a Chrysler key for my valiant.

she was like "it doesn't really matter what it looks like if it works"

I disagree because I am not using a GM key on my mopar.....wont happen!!!
Doesn't really matter what the dingbat thinks might work, it's your money she's spending so it better be up to your standards