I made my own. Actually, several of them. Here's how I did it.
I took a photo (actually several of them) of my trailer and tow vehicle. I then took the photo and put it on a Xerox copier and blew it up to 17 x 11 size. I then took the paper blow up and cut the paper down so get rid of excess. I pasted that to a board. I then used my scroll saw and cut along the edges and had a perfect replica of my camper.
The space under that was reserved for my name.
So after it was all cut out, I sanded it then painted everything with a base coat (white). After that dried, I sketched out the windows, doors, all the details and then with model paint, I painted in all the details (both sides of the sing). Once everything was done and I was happy with it. I top coated it with Varnish (about 3 coats) to give it a nice protection. I attached two small eyelets on the top, attached a small link chain and "who-lah!" Done.
Did it take time to do .... Yes!
When we traded trucks, I did another one with the new truck and trailer. When I traded trailers, I did another one with the second truck and new trailer. I did this several times. Finally, I simply wore myself out making these, so don't have one for my current rig.
For obvious reasons, I'm not putting a post of what the sign looks like since it has my name on it.
You can always go to Hobby Lobby and get the lettering, paint, and lumber and easily make one yourself. You can get wooden letters to attach to a board, all kinds of wooden decorations, designs, and styles.
Why buy something that someone else made. Your name is as personal as you. Why not make your own and then you've really got something to be proud of!