Ok, i looked at mazdatrix, and i noticed that most of their engines are over 3000$

And i read a couple of posts where people got them for 1500 or less.

I'm wondering, Where do you get your turbo engines for a swap so cheap?

 

most people buy Jspec engine cores for turbo swaps. They come resonably complete as long blocks and sometimes even trannys are included.

Of course with any engine that has been sitting for 10+ years in a junk yard (as 99% of Jspec engines have been) you will want to have it rebuilt.