I know this wouldn't have helped you as you needed it pronto and I have no idea if it's a prescription only substance or not, but I order Vaseline (in the 250 ml tub with the blue plastic lid) for about 3 euros from Amazon France.
But I do agree that you need to keep away from pharmacies unless it's for an ordonnance. Nowadays there are more and more on-line pharmacies which are generally cheaper but cost of delivery could push prices up or you might have to buy industrial quantities to qualify for free delivery. I use one where, about 4 or 5 times a year, they give you free delivery with no minimum purchase. So I stock up on my fav products and wait and order at only those times of no charge for delivery.
Apprendre une langue, c'est faire un voyage différent chaque jour.
from Fle pour les curieux