Autographics have shut down. They used to be great for all those scale replica sponsor sticker sheets but as sponsors now see scale versions as a way of making extra money with licensing these days instead of free advertising like they used to, all the extra costs (and chances of getting sued) made it non profitable.
What they have left from their stock is on ebay
http://stores.ebay.co.uk/AutoGraphics-of-California
but most of the good ones went at least a year ago.
They used to make Goodyear stickers like Tanaka has used on those buggies, but those are long gone.
Guess where I got the paint scheme for my runner Optima