Keith Naylor has the following for sale
Canon MP-E 65mm f2.8 Super Macro Lens
This lens is unique as it offers magnifications of 1:1, 2:1, 3:1, 4:1 and 5:1
New this lens costs £800, Keith is looking for offers OVER £400.
If you are interested please contact Chris Jesinger for Keith's details, also check the below link for details of the lens.