hydrolyzed whey protein

ive been carb back loading and had good results thus far. I wanted to throw in some hydro whey isolate post workout. my only concern it the cost of it. its soo damn expensive. is it worth the money? are there any other cheaper brands besides ON? and if a regular whey isolate was added to the mix in the pwo shake would it mess up the hydro whey's absorption time?

http://www.timinvermont.com/fitness/soyvswhy.htm

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