Really depends what you're looking for.
Hip waders? Chest waders? Neoprene? Breathable?
If you're looking to go cheap, your best bet is probably Canadian tire. Mind you, the cheaper you go, leaks will occur sooner rather than later.
When I first got into wading last year, I wanted breathable waders as I knew I would be fishing throughout the year, and also for long periods of time during an outing. Breathables will keep you more cool. There are downsides to breathable waders though. They are more fragile.
Neoprene waders are thick and more durable. Used mainly during the colder months of winter as they are very insulating. They are not breathable and if you sweat in them, they will stick and become a pain to remove. That's why you rarely see them in the summer months.
Then there are the rubber ones you can get at CT or something. They are not breathable and you get the same problem with them sticking to you and overheating. They are cheap and tear easily.
You also have the option of getting them with the boots attached, or without boots.
My first pair of waders were a breathable set from BPS. I didn't even take it out on the water before I returned it. I was just passing by and it was convenient for me to pick them up. After some research and several people telling me they leak regardless of how you take care of them, I went and got my money back.
I ended up getting a pair of Simms Freestone waders and got a matching pair of wading boots. No complaints. They've been good aside from when I stupidly stumbled into sharp branches while steelheading and put a small hole in one leg the 2nd time I took them out. Nothing Aquaseal can't handle though LOL :shock: