You can however get "discounts" in the form of point cards. The most generous point cards are for electrical stores like
Bic Camera and
Sakuraya. Sometimes they give up to 20% worth of the purchase price back on to your card - great for when you are buying expensive stuff. Simply put, if you spend
10000 yen on something then you get to spend
2000 yen on whatever you want on your next purchase.