You can buy Heat presses for about $299 shipped to you. Sunie and other companies out there have them. Grant it, they're not the top of the line, but at least you can get started.
As I'm typing this out I noticed ProWorld has a banner ad at the bottom of this page. They have a heat press for $169. It's a started one, but hey, at least you can get started.
Their website is
www.ProWorldInc.com hope this helps you.
Also, try searching google for Home made screen printing kits. There's a guy that says you can use an oven, or a halogen shop light (500 watts).
Sorry, I don't remember his name. He has a bunch of videos on YouTube.