are health/beauty products priced the same across all stores in Japan?

i’ve lived in Japan for a pretty long time now but i’ve finally started to realized that buying health and beauty products at Don Quixote is much more expensive than Drug stores. i’ve seen them pop up in convenience stores as well.

Where do i check to know which place sells them the cheapest, and how do you guys know where to go to buy specific things when they are all scattered everywhere at different prices.

i find it easier to find a good store and stick to that one place but it seems pretty difficult when the same thing’s sold at different places for completely different prices.

by meowtreasure444