One of the BEST and cheapest places in my opinion to get protein powders, bars, energy drinks and other nutrition, weight loss and energy boosting products is at Netrition.com
They have very competitive prices and a wide selection. Also shipping is only $4.95 for your entire order to anywhere in the US!

Select a Brand ABB Absolute Nutrition AccuFitness Amino Vital Andre's Carbo-Save AST Atkins Nutritionals Baja Bob's Balance BBS Bella Vita Betafoods BetaStatin Big Train Biochem Biotest Bob Barefoot's Best Bob's Red Mill Bodyshaping Books Bran-a-Crisp Breakthrough BSN Carb-BOOM Carbolite/Carborite CarbSense Champion Nutrition Chef Jay's Clif Bar Cytodyne CytoSport Da Vinci DeBoer Diabetisweet Dream Tan Dreamfields EAS Eden Foods Ergopharm Expert Foods Ferndale Labs Fibergel Fizogen Flexsports Flora FSI Nutrition GeniSoy GG Scandinavian Global/Image Gram's Gourmet HDT Health From The Sun Heavenly Desserts Horizon HSN IDS Instone iSatori ISS Research Jan Tana Kaizen Keto Keto-Thin La Tortilla Labrada LC Homestyles LC Success LifeSource Foods Low Carb Creations LowCarbolicious LW Scientific Mac Nut Butter Mama Lupe's MAN McCann's MD Labs/Wellements MET-Rx Miracle Foods Misty Valley Molecular Nutrition MRI MRM Muscle-Link MuscleTech Natrol Naturade Naturally Nature's Best Nature's Herbs Nature's Way Netrition Next Proteins NOW Foods Nutraceutics Nutragenics Nutrex Oils Of Aloha Optimum Nutrition Ostrim Pacific Health PBL Pharmalogic Pinnacle Power Bar PowerButter Premier Nutrition Pro Tan ProFibe Prolab Promax Pumpkorn Pure De-Lite Rosie's Gold SAN Scivation SnacLite SNI Sopharma Southern Pharmaceuticals Southern Signature Specialty Cheese Splenda SportPharma Steel's Gourmet Super Nutrition SweetLeaf Symbiotics Syntrax Tova Industries Trim Spa Twinlab Ultimate Nutrition Universal Nutrition Urban Biologics V3S Videos Worldwide Sport Z-Carb ZonePerfect

To the left are a few other places where I found some decently priced products. However, their shipping is a lot more and the end result is usually cheaper at Netrition.com

If you know of any sites with cheaper prices or other products you can't find on these sites, please email me and I will add them.