Not sure where you're at in the 5th, but there's a Franprix supermarché on the rue Mouffetard: 82, rue Mouffetard 75005 Tel: 01 43 31 67 16

I know we also passed by a little market on the way to Restaurant Perraudin, on the rue St. Jacques: 153, rue Saint Jacques 75005 Tel: 01 43 54 63 08 .

There's also a little market on Place Monge, and there's a Shopi supermarché on rue Monge: 34 rue Monge 75005 Tel: 01 46 33 60 51

There's Ed l'Épicier on the rue Lacepede, between the rue Mouffetard and rue Mongé: 37, rue Lacepede 75005 Tel: 01 44 08 91 45

Hope this helps... you'll probably find plenty more :-)

Best, Sandy in Illinois