With glaziers the price can vary a lot depending on whether they have an offcut they can use or if they have to cut it off a full sheet. Ask around.
Hmmm, perhaps I should collect some lids from Donna and bring them to conference?!
Anyone else needing them? I have family, and a neighbour, travelling to and from ChCh regularly and will be driving to the Tauranga conference in an Odyssey so plenty of room for a few lids.