i dont think that there are any TH-9 gaff decks for sale, but if you find any let me know...
The Art of Card Splitting with Martini (Marty Grams) is a good source for learning how to make your own. i dont think he teaches how to make a blank face/back but its the same as making a double backer but use a blank card instead to replace one of the layers.
on Syd Segal's Gaft Card Magic, Syd mentions a person that does all the gaffs for that dvd but dont remember the name of the person or his site... but im sure some one will be able to help you out with that. so you can get in contact with him and maybe have him make some custom gaffs for you.