You could try Oh Paris beside SSBB and the Morgan. They bake their own bread there and sell bagel 🥯 sandwiches so you might be able to just get bagels there. I know their bagel sandwiches look really good.
Most are shipped in from the mass manufacture you'll find in the markets like Carrefour. I did buy a package of the "everything bagels" , and they weren't half bad!!! You're not in NYC! LOL!!!
I arrived Thursday afternoon from Toronto on WestJet and preordered some groceries. I enjoyed my first breakfast on the island on my balcony on Friday with coffee, fruit and two pains de chocolat!! Delicious. Great way to start the day. I did get some cinnamon and raisin bagels, too, to have something on hand, but they are just the regular commercial variety. This isn't NYC, Montreal or Toronto! French pastries rule. Vive la difference!