Congratulations Tony [and your wife], what a good idea. I can't help identify it but think that your idea is great. New Zealand is an interesting place for finding glass.
It is challenging, though because it is not a populous country and the population centres are separated by mountains, water, hills or lots of road. We don't have car boot sales. buying over the local internet [Trademe], whilst relatively inexpensive, is very dicy because sellers, [myself included], still need to learn how to see and describe what they are selling carefully and faithfully.
However we have migrants from all over the world, who brought their glass with them. We [and Oz] have most of the, rare, orange, cloud glass in the world, owing to a certain set of circumstances.
We have a thriving community of contemporary glass artists, not least Gary Nash, the Hoglunds, Anne Robinson, to name a few.
So perhaps us NZ glass aficionados could have an NZ glass conference. Perhaps we do already and I just don't know??
Ruth