Hi Karen,
We had an awful job sourcing replacements when our 30 year old geese (not joking!) finally pegged it over the last winter.
In the end we sourced some goslings from
Craigievern poultry, near Drymen. I don't think they have them available all the time, but for 20, I think they'd be able to do a special order (they buy them in).
Ours started off a sort of fluorescent green colour
, and have turned into fairly standard looking white geese. We do have a spare trio available if your friend wanted to start off that way instead.
Cheers!