I wouldn't call myself an iron pumper like you guys, but I thought I'd chime in with where I buy supps.
I usually order from
www.prosource.net, and I used to order from
www.supplementwarehouse.com. Prosource generally has great, with reasonable shipping. SupplementWarehouse has LOW prices on most products, and lower prices on products that are near or past their expiration date(some which expired YEARS ago, be sure to check), though their shipping is pretty ridiculous unless you qualify for free shipping.
As far as protien, I'm still looking for the perfect one. Some pretty good ones I've tried are Syntha-6(Great taste, but carbs and fat are a bit high for me), Supreme Protein(Tastes pretty good, and acceptable nutritional content as well), and NitroWhey Extreme(reat Protien/Calorie ratio, at 100 cal/22g protien, with minimal fat/carbs, and has some supplements added like Arginine. Unfortunately, it tastes sort of like melted plastic:/)
Hope this helps!