Hi, Sandra;
I did a quick search on Amazon for "Custom Auto License Plate Frame" and this looked interesting:
https://www.amazon.com/Custom-...NALIZE/dp/B009HIHVS0
It is not an Amazon Prime site, so maybe you could find a suitable site that is also a Prime site (if that is important for you).
Most of the places I found would do a lot size of one or two frames for a reasonable price (like under $15 each).
Good luck!