Over the summer there's only 1 good freeskiing camp in Switzerland and it's with Demonium
www.demonium-mc.com
It's in Zermatt so you get winter-like snow conditions with an excellent park, sunshine, and a massive superpipe. The camp is pretty cheap considering how expensive Zermatt is, they make it as cheap as possible. If you don't need coaching you should be able to negotiate an even better price with them.
The camp has a very relaxed, French attitude... not very organized but loads of good times and a couple of really good dudes taking care of you.
The other camp (Stoked) is the worst camp you can imagine.
Saas-Fee is alright but the only swiss camps there are for snowboarders only.