I wouldn't say can't buy elsewhere, but some of the apothecary brands are cheaper, depending on where you normally are. Bioderma, Avène, La Roche-Posay come to my mind
I love picking up Biafine when I am in France. It's my go to for sunburn treatment (I am pale and use SPF but inevitably get burnt at least once every summer).
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Also La Roche Posay does a decent mascara I believe? I haven't seen it in the UK (but could have missed it!)
Thank you all, great ideas!I'm not enough of a makeup fan to recommend specific brands but if I were you I'd go to les Galeries Lafayette/Monoprix/Nocibé/Sephora and have a look around. You may also want to go to pharmacies or biocoops (organic shops), they tend to have smaller brands. Hope you had a great time in France !