(Sorry, I don't send personal 'replies' because there are a LOT of other folks that might be interested in the answer to your question. Sometimes, we'll see a Follow-up that says, "Will SOMEONE answer this guy's post??!")
Anyway, ... GAF sells them. Look in the YELLOW PAGES for a Siding Supplier (found under SIDING MATERIALS.) If they can't get it, see if they know of a supplier that can. At worst, e-mail GAF to have them find a supplier in your area.
The shingles you're looking for are here: GAF's Siding Selector. Go to their Home Page to find out how to ctc them if you need to ctc them.