Picture posting is enabled for all :)
I spent ages looking and although you see them on ebay, they go for silly money - expect to bid at least £100 for a basic 6 x 6 ft Aluminium/Glass greenhouse with some broken glass buyer to dismantle and collect.The best way forward may be to decide how much you are willing to pay then advertise in the local paper, on shops notice boards etc and you may find someone who has one unused in their back garden.You may get lucky but the days when someone would gift you a greenhouse to get rid of it are largely over I'm afraid.