Its a pain in the bum really. I spent ages on ebay, amazon, checked on 'supplies for smallholders' and Ascott too but to no avail.
My 7 year old has taken a huge interest in the chickens (and I mean huge, she's out there rain or shine feeding, cleaning etc etc) and she wants to market some of the eggs (farm gate) as she says they are perfect size for small children's breakfast. Wanted to get her some boxes and labels for her to design ... looks like we are back to straw lined 'normal' egg boxes then!