Canopy glue is so easy to use and being completely bulletproof for installing canopies, it's worth ordering some. I've not seen any CA available in modeling quantities that is as cheap as Tower's or Horizon's prices, so if I were you, I'd consider ordering some CA and a bottle of canopy glue. It's that good. And if you're buying CA somewhere other than from a hobby retailer, you're probably going to save some money.

It's excellent and foolproof and easy.