I was doing some window shopping at Babou Venissieux when all of the sudden I came upon a real fluted pie plate! As if that weren't great enough already, it was only 2,99€ They came in all different sizes for a medium 1.4 quart to individual sized plates. You should be able to see from the pic that the largest size is slightly smaller than my grandmother's tin pie plate on the bottom. They were a little hard to find. Look in the aisle with all the frying pans, then look on the bottom shelf by the pillar. There were at least five or six when I left.
You can get a lot of good deals at Babou, it's kind of like the walmart of Lyon. They all kinds of birthday candles, like the ones we are use to seeing in the US for really cheap. It's a good store to check out if you need something, don't need something of super high quality and don't want to pay an arm and a leg. If you don't have a car the twelve goes by there.
You can also usually get some nice ceramic pie plates from stores like Alice Delice, which now has a shop downtown, and from stores like BHV in the Part Dieu.