About a year ago I needed new bateries and after reading about them here decided to go with the Optima red tops. I bought one at Auto Zone and paid 109. 00. A week later I bought the other one at Costco and paid 99. 00. I was back in Costco less than two weeks ago and noticed that they are now carrying the yellow tops. The thing I really took note of the price was 138. 99 for the red tops. I was back in Costco today and decided to look at the Optimas again and about fell over when I saw the price on the red tops had gone up to 146. 99. My son is needing batteries in his 97 and was on his way to Auto Zone so I asked him to check their price on the red tops. He reported that they quoted him 186. 95. I know they claim they have a 99. 5% pure lead content but they are pricing these things like they are made of gold. Have other brands of batteries taken a huge price increase? Evidently,the US dollar is in a hyper inflation phase.