I don't own her bags, but I've been looking for a little while. Her stuffs are hard to find in US. I've heard they don't allow online sales. And I'm not sure stores which carry IM also have her handbags. Sometimes I see on eBay listed by french sellers. I just found this image. Her bags are somehow similar to her husband's (Jerome Dreyfuss).
Even here in France it is difficult to find Isabel Marant's clothes, you have to go to Paris if you want the complete collection... I heard that Isabel Marant doesn't want to sell her creations online anymore, but for foreingers you can find some pieces of the collection on ebay: