[Terrysch]

As Chev-obsession stated the standard 2.0 inch outlet ones are not hard to find.
In addition to the Forum(best option in my opinion) and local swap meets two other good options are eBay and regional/California Craigslist. To find California and Regional Craigslist you can use Search Tempest - it searches all Craigslist sites.

You may want to consider going to a 2.5 inch outlet. Will improve performance. Discussed in a number of threads on the Forum.
Unless you want to stay OEM only.

That is what I am putting on my 72 Jimmy replacing the headers. But the 2.5 inch were only used on 62 -75 High performance corvettes. Good ones are hard to find and can be costly.

But this is an individual decision, just like the infamous intake manifolds versus headers discussion. I wanted to get a quieter ride but not sacrifice performance. Why I went with the hard to find 2.5 inch outlet manifolds.

For 2.0 inch I found some nice sets on eBay. Reasonable costs.

A word of warning. The hard part is finding a set with no cracks and no warping, especially around the mounting holes.

When I looked at eBay, I was able to find nice 2.0 inch sets that had been magna fluxed to check for cracks. Some also had been blasted. One of the benefits of the forum is buying from others who know that there are no cracks. The ones you can not see are the challenge.

The biggest advice I can give you is buy quality, not price, to make sure you can a good set without cracks or warping.

Terry