For me, it has to be Leuchtturn1917's 120g/m³. Also like Rhodia, though it's a bit thin for my preference. Happy to hear you guys' suggestions for a slightly heavier (let's say 100g/m³ and above) paper, either loose leaf or in a notebook.
Clairefontaine cheap 😭? I paid 4 euro for an A5 booklet a few years ago, in western Europe (but not France). I can remember Oxford being significantly cheaper and still quite good.