The cheapest domestic place to buy your stuff is Amazon.co.jp. There you can find 3kg of flavoured protein powder for just over 7,000yen. That's almost 5,000yen less than the same product in Xebio. It's also one of the lowest calorie choices on the market (if that is something you care about).
Of course, if you have some criteria other than price and calorie content, there are choices for you, too. Here are a couple, or you can just run your own search on Amazon.
Savas Whey Protein, which is just over 8,000yen for 2.5kg.
Savas Weight Down, which is a low-cal soy protein alternative at about 4,000yen for 1.2kg
Kentai 100% Whey, which is a muscle-building higher-calorie choice (400kcal per 100g) and around 5,000yen per kg.
Big-in-Japan brand DNS has numerous 100% whey flavours at about 10,000yen per 3kg.
Don't forget your shaker bottle!
- There are also great deals to be had when importing whey, as one of our Twitter followers pointed out. Prices are slightly less, but beware of the (albeit slight, but seemingly random) possibility of being charged import tax.
- AccessJ is not trying to get you to buy this protein to make money. I buy a bag of this stuff (cheapest) every month or so. It's perfect.