OK here goes.
Nasbinals: Hotel La Route d'Argent. E55.50 per person, half board. basic hotel, breakfast included cheese and meat, robust country cooking, gruff but friendly family welcome.
St Chely d'Aubrac: Gite St Andre. E 38 per person half board. Lovely bed and breakfast. Everyone (8 guests perhaps) ate together. Delicious filling food. Modern and comfortable decor.
St Come d'Olt: the Couvent de Malet. Basic beef stew for dinner, all eat together and served self-service. Still a convent, in a different wing. This was a lovely experience.
Estaing: Chambre d'hotes Lou Bellut, Mme Monique Simon - lovely location, dead centre. Very nice welcome by lady who also runs the gift shop. Tiny and personal. E 50 bed and breakfast for us both.
Espeyrac: Hotel de la Vallee. Not recommended, but I don't think there is much alternative! Basic hotel, we had half board. Don't have a record of the cost.
Conques: the Abbaye. Wonderful.