The list below may not be current but it may give you an idea of what your going to pay for a used unit : Please ring for a current list.
225W domestic marbella 22 tube + door £850- 1 remaining (1 year waranty )
all prices ex-delivery .(free in Nottingham)
lots of the following , sunquest aurora low hours from £3000 – £4000
tansun (all models ) £3000-4000
Price depends on age / quality