retro computing to go with your bike!

[keefym]

i have just pulled out of the loft an old bbc acorn computer, has the computer, the monitor but unfortunately no leads, i modded an old aerial cable to test that it works and it does yay!
i also have the secondary proccessor unit to go with it, i know these fetch a bit of money on the bay but i hate using that place so im offering it up here instead.

i have no idea price wise what to ask so i am offering it for swaps for mountain bike bits or other newer computer components, WHY?