Best place for a new engine

So we just got a 1990 Miata to build for the GRM $2014 challenge. After running a compression test, it looks like the piston rings may be pretty worn in addition to having some SNC crank wobble. So I am looking into a replacement engine.

Does anyone have any recommendations on where to look (besides craigslist) for a sub-150k mile 1.6 engine? We can't spend any more than a couple hundred dollars. I was thinking 1.6s should be pretty cheap since most people go for the 1.8.

You might call Steven and Miata Solutions to see if he has any, as well as Track Dog Racing. They both have done more than a few 1.6 to 1.8 conversion over the years so may have some 1.6s gathering dust.

There is a $500 93 on CL that you could recoup all of your cost from in parts sales.

This one? http://dallas.craigslist.org/dal/cto/4627363369.html

Yep. If I had the time and space I'd have already bought it to flip. Can't really lose at that price.