I got them from Best Stickers .net. You can get the Crossfire logo, SRT6, etc... They only show the black & white version, but you can modify your order.
Their customer service is very good. I explained exactly what I wanted and she told me how to do it in the order form. They're in Latvia.
I don't like that they're using a trademarked logo, but Chrysler doesn't make these and I haven't seen them anywhere else.