There is such a thing as being too frugal. I crossed that line recently, but was fortunate that I did not pay dearly for it. I bought a product over the internet that was a great deal for what was described. The 'cans' of product were about half the price of other similar items. $40 plus postage later, I had the items. I could have lived with the fact that the pictures on the internet made the 'cans' look a lot like #10 cans, which they were not. What I couldn't live with was that the 'cans' were cardboard sleeves. Not exactly a long-term food storage item.
Even in our low humidity, the product may have lasted a year. That did not fit my needs. I e-mailed the seller, who stood by the merchandise and provided a full refund, including the cost of return shipping. What I learned is to stick with my tried and true suppliers, be patient and wait for their sales and specials, and not go through this type of discovery to save a few bucks. I wasted a couple of hours of my time, some gas for the truck, and didn't save a nickel -- which was not what I planned.