One thing to consider when buying new is that all measuring cups are not created equal. Consumer Reports did a review a few years ago and the Pyrex ones were actually rather inaccurate. I don't remember the details any more, but several brands were 1/8 cup or more off.
As I recall, the top recommendation was the Oxo ones with the angled side that you can read the graduations from the top as well as from the side. A great feature - you can set it level on the counter, pour in the ingredient and read the amount as you pour - no more adding a bit, checking, adding more, checking, pouring out excess, or bending over to read straight from the side. I have both the 1 and 2 cup versions of those (bought after reading the review), plus the 4 cup Pyrex. Since mine never go in the dishwasher, they stay in pristine condition. I can't put them in the machine because when I do I always need one of the cups before the next time we run it.