So the dealer has a parts department and a part number, but cannot special order the part for you?
Visit their parts department and ask them to special order one with that exact PN. Tell them that you're looking for "Toyota" "nameplate" from the "trim package," "colored."
The standard "TOYOTA" nameplate (PN 75443-20610) is easy to find since its often on department inventory. It can be purchased for about $20 to $30. IIRC, the colored one in your picture is one of several different color "trim package" styles available. Not every dealership has them on hand, but they can be special ordered.
They are made of plastic with an adhesive backing. The alternate colors are silver (standard/stock), red, black, white -- I believe that blue may also be an option. These retailed for about $45-$70 the last time I bought one -- I've purchased a few for different Toyota vehicles over the recent years. They're usually priced about $30 more than the standard all-silver version.
NOTE: The entire name plate material is plastic. It is not metal.
TIP: If your local Toyota parts department isn't able to locate the parts you're looking for, you can always call any other Toyota parts department and they will also be happy to assist with the special order -- and ship it to wherever you want, even to your local dealership's parts department.
One that I've dealt with a few times in the past is:
The parts department @ Toyota of Puyallup (888-928-1948)http://www.toyotaofpuyallup.com/
1400 River Road, Puyallup, WA 98371
Also have a look here:http://www.autopartspeople.com
Also try the parts department @ Carson Toyota (800-90-TOYOTA)http://www.carsontoyota.com
1333 E. 223rd Street, Carson, CA 90745