I finished up last week's bathroom week by ordering the exact new shower curtain liner I wanted from ebay. Mildew resistance was the number one consideration, since this is for the bathroom in which I've fought mildew recently. We have a fan in the other bathroom but since this one has a window the builder didn't think a fan was necessary. If I had it to do over, I would have insisted on one I think.
Don't like the curtains that are heavy weight because I'm still using the (probably old fashioned) plastic hook style. So it was tricky to find one that had both mildew resistance and was lightweight. Glad I could shop the internet.