bought one from ebay - 50quid
Brilliant bit of kit - if you have a small rib it's ideal as it has two 12v charging sockets all fused with rubber lids (mobile phones, gps, search light?), and two external terminals whith a heavy weight fuse - it even looks heavy enough to take a jump start - but certainly easy to connect a charger two - rather than the hassel before of removing the strap and lid where it is hard to get to in my console - it also has a condition meter built into the top which is operated by pressing a button. Great stuff - and all very high quality - recommended