I do the same... buying things in advance... but I go through Atomic Fireballs... instead of paying $3-$5 for a 4 oz. bag of them at the supermarket... I go and buy them for like $6/lb. and get 2 or 3 lbs. of them to last the month...

Oh yeah, and Reese's peanut butter cups... I love those... and instead of paying $0.50-$0.75 for two of 'em, Wal-Mart has their brand of 'em that tastes just as good... for like $2.49 for a bag of 50...