Roast your own...
Buy 1kg raw, shelled, peanuts
Create a salt solution with, say, 1 tablespoon of salt in 1L water
Soak the peanuts in the salt solution for about 20 minutes
Drain the peanuts
Heat your oven to about 200 degrees C
Put the drained peanuts in a baking tray
Put the tray in the oven for about 23 minutes
Remove and cool