http://www.ebay.co.uk/itm/DSO138-2-4-TF ... Sw9r1WA5ep
Now a scope for just over twelve quid? When I was younger a 'scope was the best part of a grand! This one is colour, and works off a 9v battery. OK so there's no box and you have to solder it together yourself which takes an hour and a half, but it works fine. OK for basic signal 'look sees' but often thats all you need.
Expect to see it at future Nanos for having quick looks at things like Kbus when there are problems.
BTW, off to play with the proper one now!