Oh, it's more than that. They charge another $18+ shipping and $10+ tax. That is why I have been hesitating in ordering it. I also looked over the list. What I'm not sure about are Motor, Plastic Propeller, Axial Fan: what kind should I buy if I go buy them myself? Also Mesh Squares, what are they for? Wooden Dowels: Balsa wood? How thick? A design that shows what goes where will be helpful.
The motor is just a typical DC motor; the little metal cylinder with a shaft and two leads or wire tabs. Radio Shack sells them individually for $2-3 but if you ask the technology/science teachers at your school, they may just have a whole bin of them sitting around. The plastic propeller is literally nothing more than a twisted piece of plastic; you can buy multi packs online if you want to test out a variety, but they're also not hard to make - cut a strip of some thin rigid plastic, punch a hole through the middle with a hot nail, and if you warm it up over a flame for a few seconds you can twist it into a propeller shape. I believe the axial fan that comes with the kit is a small computer cooling fan. If you have no idea where to salvage one, check the links to DigiKey a few pages back in this thread. We wound up testing a few, and were able to find one that can lift the max weight for under $30 - but a smaller one, for much less than that, will do just fine. Mesh squares are for compliance with rule 4.e - the propellers must be shielded. Keep your eyes peeled and you'll find something lying around suitable for that (a pair of scissors may be needed). The dowel is for compliance with 4.g - 1/4" or more, for triggering the photogates. 1/4" is pretty standard "dowel size" so again, just look around for one, or pop in to the nearest dollar store.
As for how to put it altogether, you could probably reverse engineer it from the Ward's kit picture. Or, better yet, check out some of the videos on YouTube (there were links either in this thread or the Hovercraft thread in General Chat) and you'll see a hovercraft assembled from start to finish.