I buy unflavoured concentrate from eBay for about a third to half of the price of what you can find in brick and mortar stores. Unflavoured tastes like cardboard the first few times you drink it but you should get used to the taste, I did. There is also cheaper, flavoured concentrate on eBay if you cannot stomach unflavoured. Just search "whey protein concentrate".
The fitness/supplement industry is full of ridiculous and unmeasurable claims and fancy packaging pretty much wherever you look. The cows it comes from and process of extraction of whey is literally the same for every brand of protein on the market and the only differences in final product are what has been added in by the individual company. Protein is protein and the only real differences you can find are between isolate and concentrate, and it would be a waste of money to buy isolate anyway since none of you are dieting down to 5% body fat or have serious cholesterol problems, I presume.
Save your money, avoid the gimmicks, and buy from Ebay.