Bowman is one of the best. He’s one of the largest importers in the US!! He’s good to go!I live in Tulsa so I’m at these shows regularly. The only local gunshow that I can recommend is Wanenmacher.
For parts kits… here’s a link to the cheapest kit that I’ve seen lately. I know very little about the company, but they look legit; they sell a lot on GB and have stellar back. https://bowmanarms.com/uzi-parts-kit/