Have you tried Amazon?
Nestlé controls the entire sale and price of capsules. While the machines are sold in various places, the capsules can only be bought on their own website or at a boutique. Normally I have to order online because the nearest brick-and-mortar is hundreds of kms away; figured I'd stop by while there already in the centre of Toulouse and wow.....yeah.......what a difference in price.
Kind of like how wine AOC Saint-Émilion normally runs 20-30 $US but in France it's fairly cheap 6-9€ bottle. Yes, I brought a bottle of wine back as well.