Printing License Plates for Model Cars

Hey friends, I wish to print license plates for the model cars that I do. I’ve checked out several websites, one of which I use (http://www.acme.com/licensemaker) but am not fully content with because the images are bitmaps and the resolution is somewhat poor. The Platemaker used to provide quality, high-resolution plates but I believe he is no longer in business. Does anybody know if there is a program, or website where one can utilize vector images to make plates? Surely there must be something out there.

Thanks,

John