I know how you feel. I love to buy fabric, but I especially love to buy fabric when it's a good deal!
Last week I was in Tuesday Morning or whatever that store is called. They had two jelly rolls. One I'd seen before, and the quality wasn't great. The other was a different brand and had some interesting patterns. The problem? The first one was easily twice the size (and therefore number of strips) than the second, but they were the same price! I looked closely at the tag on the one I liked, and it was incorrect -- it said charm squares. So I took them both up to the register and explained that the price couldn't be right, as the tag was wrong and the size/amount of fabric was obviously less than the other one at the same price. Honestly, if they'd knocked off even some money, I would have bought the jelly roll I had my eye on. But he said he wasn't allowed to change the price, it had to sell at what the tag said. I was so annoyed, I just left and didn't buy anything.
Like you said, there is other fabric out there I am meant to buy...