We sell 303 at our store for hot tub covers - the difference between the 303 and Armorall is the 303 does not have alcohol in it. Over time, Armorall will eventually dry out vinyl and rubber causing cracks and surface breaks. You should be able to find it offline in any reputable Hot Tub / Spa retailer. My only issue with it is the cost as it can be 3 to 4 times the cost of any other non-alcohol protectant.
2010 SE 4x4 King Cab - aka the Stormtrooper
'06 Black Powdercoated 4-Spokes
Big Country Step Bars
Dolphin Low Profile Tool Box
Alpine 6.5's / 6x9's / Pioneer 10" Sub
Sony iPod Head Unit
CoverKing seat covers