Where to get the correct 360 oil pan.

I have found E-bay and many discount places aren't a great place to buy oil pans. Most I've seen even when their correct for the engine don't fit good and end up leaking or are made of thinner metal than the stock ones and warp easily. They may be cheaper but you get what you pay for. I won't use anything except factory or a big name brand anymore after a couple of bad experiences with cheap ones.