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’ve decided to buy LPR skincare as that’s what I usually use, and I will also try and find the mascara @mindlessness has mentioned — I actually need a new mascara! France has been great so far, I wish I spoke better French though as it would have made things so much easierI'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 !