I'm aware this might not be hugely helpful but the Finnish brand Jopo uses 22" tyres and I think last time we needed some we got them from Finland. Also some Radwagons but silly fat width.
in theory very helpful (esp. the Finnish stuff), but I've already ordered some road cruisers for 15€ each, can't really beat that for something that mainly has to be cheap.
I'm aware this might not be hugely helpful but the Finnish brand Jopo uses 22" tyres and I think last time we needed some we got them from Finland. Also some Radwagons but silly fat width.