i used to buy 10 lbs bag of whey from o.n
2 years ago - 75 euros
now 108 euros
price are increasing in usa too 
Yes, prices on most proteins have gone up considerably here over the last several years.
Last year's drought was expected to impact milk prices, but they've actually held pretty steady - at least where I live. Someone had mentioned a govt cap, but I don't know the details.