If you mean the Tyco A-Team set, finding a Decal set alone for sale is probably impossible.... :( I have the A-Team train set (obtained used) with decals already applied on all pieces by the former owner.
Not sure if you would be interested, but the auction price (if it stays low) is pretty good considering the boxed sets go for anywhere between $200-$300 on Ebay as well, and this one is practically the same thing, except without the box.
By the way, I need both the helicopter and van. "Let your light so shine before men, that they may see your good works, and glorify your Father which is in Heaven." - Matthew 5:16