Buying an FA20
 

My engine seized up and I’m trying to get a replacement. Any idea on where to get one shipped here or bought from here?

Well, there's the member classifies here. You can post a "want to buy" post.
There is eBay, junk/salvage yards even Craigslist.
Unfortunately the shipping to your location is going to cost an arm and a leg, but you already know that.

Option 2 is a complete rebuild. Which would end up the same as a used block...

Maybe you can call around a few mechanic shops, maybe they can help you find a cheap one.