Just had a look. It's $70! I was really lucky for having payed 15E together with 3 prism attachments. But since you're into DIY... you could make your own. All you need is some mirrors and ducttape. I've made mine with plexiglass mirrors I got from the scrap heap of a local plastics factory. Advantage is you'll be able to make it big enough to fit your camera inside and point it to the sides for off center teleidoscope goodness.