I have VERY hard water so I use citric acid to clean the electric kettle. I noticed I needed more so I went to my order history in Amazon. When I purchased the 5lb jar on 6/23/2011 it was $26.49. Today the very same product is $73.77. WTF? I wish I had invested in citric acid futures 4 years ago.
Fortunately a different brand was only $21.99 for 5lb. The only difference the new one arrives in a bag. The jug must be a collectors item since it cost $51.78.
Who buys the wildly over priced stuff?