What you will need to do is keep an eye on various listings that will tell you of regional plant fairs, such as these
And regularly search for “foire des plantes limousin”. There are some running through to October, but the bulk of the most interesting plant fairs are april - june.
For apple trees I personally would go to a specialist apple nursery. You will find that many of the garden centres stock fruit trees that are grown in the Haute Savoie, like this one:
I don’t know about the Limousin, but as Vero says search your local directory to see if similar.
If you are interested in apple varieties, especially traditional regional and ancient varieties then see if there is a branch of the croquers in your patch. Like many people passionate about a subject our local group are fascinating people, and offer sessions on correct pruning, grafting apples and so on as well as advice on which varieties grow best locally.