If you want a cheap pair of breathables, try mail order from cabelas. You can also pick up a pair at bps but I have heard that a lot of people has had leaking problems with the white river brand.
If you want to spend the dough for a good quality pair that will last you a lifetime, look at the LL bean Wicked Tough gortex waders. You pay the price but they are waders for life. Any leaks, send them back and they will replace them for you. I think they will even pay for shipping. I've had mine for a year and no issues. Good luck.