Quantity   Component name
1 × 5110 Nokia LCD Perhas the least cost LCD available on the internet these days,
1 × Arduino Pro Mini compatible. So cheap they might as well give them away.
1 × LiPo Battery Whatever you have to hand.
1 × LiPo Charger board. Less than a dollar.. did I mention this was a cheap build...
1 × A CHDK enabled camera Up to you what to use... mine was a "fixer-upper" from ebay - not quite free, but the P&P was more than the camera.
1 × Suitable connectors to wire everything together.
1 × Logic level mosfet or 3v relay + diode ... to switch the camera on with