We’ll be using a simple custom-built £25 Raspberry Pi case, with all the right slots for its outputs, that comes with a small solar panel, a battery case and a micro-USB cable. You’ll just need to supply your own NiMH rechargeable batteries.
Point your browser over here — you’ll find all the information you need to place an order via PayPal. The maker, Cottonpickers, has an eBay page as well if you’re more comfortable making your purchase that way.