Well see that very cool SHUTTLE XING sign in the foreground? It was designed by Traffic Management, a company who makes all kinds of road signs, and is now being offered for sale on their website as a novelty sign..
Original Design by Traffic Management Inc., the official Traffic Management company responsible for Mission 26 of the STS Endeavor on October 12th and 13th 2012.
If you visit the Traffic Management Novelty Sign page you will see the entire list of sizes they have available for immediate ordering. Just a word of caution though concerning shipping. A fellow Space Geek purchased the 12 inch x 12 inch sign and shipping cost just more than the sign itself did ($25 for the sign and $27.95 for the shipping).
That's awesome. Thanks for pointing this out Richard!