Myself my cousin and two mate,s have all had trouble buying old stock birds, 5 to 6 yr old stock priced from £300 to £1350 each. Out of 6 birds 3 only layed or filled 1 egg 3 did,nt fill at all. To me it,s not worth the hassle then as you get a replacement that you don't really wont and 1 replacement also failed to fill so i put it in the bin rather than return it for them to check that it was infertile. And go through it all again so i wont buy any more of there older stock bird,s in the future. Not knocking them this is just our experience and 3 friends of buying there retired stock birds.