Ecthing circuit boards

Here are a few different ways to etch your own circuit boards:

This is probably the cheapest, the laser printer toner transfer. All you need is the etchant chemical and a copper clad board (I've also done this using a sharpie to draw the resist onto the copper clad board):
http://www.instructables.com/id/PCB-etching-using-laser-printer/

Jameco sells a kit for $46 to do photo resist etching, which is by far the best way to make really professional boards. Check out the video on their site explaining the process:
http://www.jameco.com/Jameco/PressRoom/makeoneetch.html