I buy the cheapest CR2032 batteries I can find on eBay. I bought an unlabeled pack of 20 for $1.95 shipped from China in January 2017. I have a few left and was telling myself last week that I need to order more. I put them in car remote fobs, the garage remote controls, and the high ceiling fan remote, and there are many other uses. They work well enough. It does not feel like I am replacing them more often than brand-name batteries.
At that price, my biggest concern might be whether the manufacturer could be cheating on environmental regulations, either through its manufacturing process or the metals and chemicals in the batteries themselves for future disposal. It is only a thought; I have no evidence one way or the other.
I stock an assortment of replacement "button" batteries in my home office. I keep them in a small plastic tub, the kind that sandwich meat comes in. My spouse has a large number of inexpensive costume jewelry watches. At least I was able to teach her to pull out the stem to stop the watch before putting it away. It isn't about the cost of batteries, it is my time to replace them. She has so many of those cheap watches that it seemed like I was replacing batteries every day until she learned to turn the watches off, other than "today's watch."
I do not understand the disparity in shipping costs from China to the US, versus the other direction. How anyone can sell 20 CR2032 batteries from China, deliver them to my front door, and make a profit, all for $1.95 is beyond me. If I buy something from China, I assume it is "no return policy" because the cost for me to return those same batteries back to China would be very high. As my father said, "You pays your money and you takes your chances."