Those may have originated w/ the Pac-NW VCA.
We did several stickers with a "Signs Now" shop and posted their 800 number. They were sold as fundraiser for our VCA way back in 94-95. At one time I had posted their number on the old site, and lottsa folks bought them. (I think we made a total of $36 profit!!!!)
You could even order in "shadow" with a contrasting color behind.
Any size was available as well.
Many clubs did similiar stickers.... WA / OR have cool ones now!
JonB