I've only seen a couple true native mesquite enginerred out there so far. It's tough to cut thin enough and you cannot rotary peel it like many manufacturers do.
I did just get some mesquite to makes some sample boards, nice looking stuff;
http://www.mesquitewoodproducts.com/about.htmlI have heard good things about them and their milling. But they do not offer engineered. However you can glue down the 1/2 inch and finish it yourself if your careful. I just put some Rubio Monocoat on a sample and it's looking mighty fine! Super easy finish to use and all natural.
Thats not a bad price on the first link, comes to about $7.70 or something per sf prefinished. The unfinished solid 1/2 in from the last link is running that much as well. There's a mesquite place just south of me that want $13 a sf and it's not even tongue an grooved!!
Tell Alan I sent you if you could.