green house windows (Cefn Mawr LL14)

during the wind we have had some plastic windows blown out of the greenhouse and they must have gone off on their jollies somewhere. does anyone have any spare. ours are 24inches by 45 inches and are the 3 panel type, although anything that size may do. i am happy to remove, or collect the whole thing if that might be easier. we are retired so can collect most any time. thanks a lot.