If you're worried about cost, you can try what I did...Oklahoma doesn't have a front plate, either.

After removing the plate holder, I discovered that Lowe's sells plastic panel pins (the little pins that hold on all the panels inside cars). I found some that were dark gray and went with my graphite (I think they were for a Nissan). They were in the drawers with all the specialty fasteners. I had to trim the stems so they would press fit into the holes.

I would imagine that an auto parts store would have a wider color selection, or you could paint the pins to match. If you look closely on this pic, you can see what I did.

Hope this helps.