If you haven’t seen it yet, you need to check out the (relatively) new twin lens reflex “toy” camera from Superheadz. It’s made of plastic, like the classic Diana and Holga cameras that have such a cult following in the photography world. But being a TLR is has two lenses — one for taking the photograph and the other for the waist-level viewfinder. Behind this second lens is a mirror at a 45-degree angle (hense the term ‘reflex’ in the name) reflecting light towards the top of the camera to the screen where you can view your subject. Some of the most popular twin lens reflex cameras are/were made by Rolleiflex and Yashicamat, among others.
Anyway, the Blackbird, fly is a really cool camera, especially for it’s price (just over $100). More info at BlackbirdFlyCamera.com