Quarter plate film
Flickr challenge: buy kit at the local Camera fair in total less than £10 and take a picture with it that afternoon.
From dealers' junk baskets I bought a broken camera body (£3), a lens with broken shutter (£2) and from a different dealer, 4 rusty plate holders (£2). I bought a pack of plates too (left, £2.50) but ended up using some sheet film I brought with me (right, from ebay at a similar price) instead because I wasn't clever enough to see how to load the holders with the glass plates. (I wish I had persevered - I have since seen how I should have done that.)