Being frugal can be fun. Some of us get a measure of satisfaction in getting the best value for money with even the smallest purchases. Here are a couple of recent examples from my home:
I'm an oatmeal eater, and have been a regular buyer of Quaker Oats' jumbo box of whole oats sold by Costco. These oats are cheaper (by weight) than any other packaged whole oats we had found at any store ... until last week. We have a neighborhood wholesaler that sells flour, grains, nuts, and all types of cooking/baking ingredients. The shopkeeper buys big 50lb (?) burlap sacks of goods and then pieces them out as customers buy. I just discovered he offers whole oats for NT$25/jin, which comes to about 50% cheaper than the Costco product. So it is half price, and one can buy as little or as much as they like. Great deal.
Make your own soybean milk - it is not rocket science and a hell of a lot cheaper than store-bought milk. A couple days ago my better half soaked, boiled, pulverized, and then cooked/sweetened to taste about NT$40 worth of soybeans. That yielded us about 1.5 gallons of soybean milk (depending on how thick one likes it), and enough beans left over to make a bean salad for several servings. To do this you obviously need to have some time on your hands, and enjoy working in the kitchen. We put a premium on knowing what is in the beverage we're drinking, so love the homemade hands down.