Metro has it but they are OFTEN sold out…
When they have it they charge about 18 kuai for 250 (or maybe 200) grams. They have it on one of the top shelfs in the cheese section, small red & white canister.
Auchan has Creme Fraiche (not sure about spelling)once in a while, prices are all over, from 30 to 50 kuai but they are also often sold out.
Daniel