I had heard that the Renault one was available at LIDL in France only. During my recent trip I located as many LIDL stores as possible en-route. None of them had any.
I had heard about someone selling them from Renault Classic Car Club Forum on Facebook. Although expensive I had ordered one before I left for the trip.
The Citroen one I saw in a LeClerc supermarket by chance.
I bought a load from Lidl in France two years ago. Seen the odd one in supermarkets and some gift type shops too. So far I think I've got R4, Peugeot J7 and Citroen H variants. There's an Estafette as well but that's escaped me so far. There was someone selling them on eBay.fr a while back too.