Sugar Creek is Joe Salva.
He's a busy guy and does the decals and carb kits in his spare time -- as much as an enthusiast himself as he does it as a business. He did the airbox/carb cover sticker for my SP81 nearly from scratch and it took a couple months for him to finally wrap it up. I think he charged me 18 bux when it was all said and done. Needless to say, he didn't make squat on it, but he now has the design finished for any additional orders that may come along thanks to my cooperation, measurements, pics, and template. Fair enuff, I guess. He was very easy to work with.
In most cases he does the decals on a per order basis as opposed to having them on the shelf ready to ship. (I can't speak for the carb kits.) The designs are already there and ready to go for anything he advertises, just not necessarily the finished product unless actually ordered. And whatever you do, go direct to Sugar Creek and not through any third party that may be middling his orders. I made the mistake of going through Chainsawr for a bar stencil that was "Ready to Ship!". When contacted a couple weeks later wondering where my order was they just punted and told me to contact Suger Creek directly anyway.