With any purchase above 175 euros in France from the same store, you can get back the detaxe which ranges from 10% to 14%. Depending on the store. You just fill out the paper work in the store and bring it to the inspection desk at the airport on your way out and have it stamped and processed. They'll want to see the goods, so make sure it is handy. Thereafter, they give you the detaxe in cash or into your credit card (takes 3 months). It's easy and it always works.
Is that before or after checking in your luggage? Hope it's before. Can't imagine carrying all my goodies as hand luggage. Do you actally check in your expensive bags? Will it get stolen?