While I wouldn't usually suggest REI (aka "MSRP World") as a low-cost source, watch for their sales. Start with 10% off 10 or more "performance foods," get it up to $100 when they're having $20 off $100 order, add free shipping at that order level, and finish off with 7-10% dividend. 35-40% off and you're getting down to a reasonable price.