Help!

I’m off on a bloggers’ day trip to Paris on the Eurostar on Saturday. Where shall I go during my 3 hours shopping slot? I want to go to Colette but haven’t got further than that. I’m giving myself €100 to spend all day so I will mostly be window shopping but may stretch to the odd T-shirt, book or Hermes Constance bag cloud Post-it notes

What would you recommend for someone on a strict budget?