I am happy to hear that you do the shopping in your household as you stay with your sister, as a good shopper you always shop three times in a month as you find it enjoyable while purchasing the items you need.

With your explanation it's clear that your are a very good bargainer, and yes women are best when it comes to bargaining than men.
Indeed the quality of the product is very important irrespective of it's price which is why you choose brand over service.

I wish you the best my friend, in this challenge.