There is for example a nursery in France that has citrus fruit baskets now, but it is tied to what is ripe at this time. Not everything in it is cold hardy either. I've seen them sold containing Keraji, Ichang Lemon, and of course Yuzu and Satsuma. Throughout the year they sell citrus to restaurants. The window of ripe fruit is quite small, they are not processed and treated for storage in the way they do in commercial fruit nurseries.
https://agrumes-vessieres.fr/categorie-produit/nos-fruitsThere is not much commercial fruit cultivation of the hardy varieties, and if there is, then they will likely not have a wide range of varieties. Only something like satsuma and Yuzu I expect.
Best you can do is contact/visit nurseries that sell hardy citrus plants and ask what is ripe on the trees at that time. Or ask in citrus facebook groups or forums.