A quick check on ebay and Amazon. Looks like there's nothing cheaper than $30. Hm, what to do, what to do?
Oh right, in the same "do it myself" spirit that I've been relishing for the past few months, I could make myself a kit! And of course, there are several youtube videos out there using simple materials. Now I just need to acquire two matching wooden picture or canvas frames (craft store), a staple gun (Hugh's dad?), and some nylon screen for windows (surely, the giant hardware store up the road will have some).