I did see something just like that on e-bay a few months ago, do a check there, may-be some are still around, good luck! The starting price was $5, but don't know what they actually sold for, hope you find one.
I just did a search on Google for "custom license plate frames" . Use the quotes to eliminate a lot of junk. Found places that will make frames ranging from plastic to brushed aluminum or brass. Not real expensive either.
In our area Tennessee, there are craft & art shows. Sometimes there are people there who do custom plates. They will paint/air brush or write most anything you might want. Also sometimes in the Mall's around Christmas time you might find someone there that does this.
Again you might try Ebay they have everything.