Kids climbing/play frame

I'm looking to build a outdoor climbing/tower/playhouse with swing and slide and the like. To buy one of these complete is mega expensive, any ideas where I can get info on how to source parts and build this type of thing.

Thanks

woosie - try the keyklamp system. We've used it for doing similar projects; supplied in different diameters depending on the tube size. Buy the galvanised tube from your local steel stockist (they'll deliver). Hire a hydraulic tube bender if you want curves or interesting bends & hire a chop saw for cutting (you can use a 9" angle grinder with a steel cutting disc at a push).

http://commercecenter.keeklamp.com/Main.asp