I believe that there is still an American food store in the 7th arrondissement not far from the Musee Rodin:

The Real McCoy. Hundreds of U.S. grocery items. Sandwiches and home- baked goods. Bilingual service. 194, Rue de Grenelle, 7th, Tel/Fax (33)1.45.56.98.82, 10:00 a.m.-8:00 p.m. every day.

You could fax them your shopping list. Be prepared to pay a premium. For example, I recall that a package of oreo cookies cost the equivalent of $7-8.

Mark Los Angeles