I've seen a few, in antiques programmes on TV, and almost every museum and country-house display room.
The last time I saw one for sale was about 15 years ago. GBP £50? I think.
As you know, condition is everything. But these metal canisters/cans tended to rust, especially when stored in damp garages.
Have you tried searching eBay, worldwide, for 'completed auctions'?