Amazon has a 20-count bag of Frito-Lay Chips Flavor Mix
on sale for $5.45.
Clip a 50-cent off coupon on the site to knock the price down to $4.95.
That's over a dollar savings from the typical grocery store sale price.
Also, if you use discount site Living Social, use promo code 5OFF15 to save $5 off an order of $15 or more now through Sunday.