I was right here about 6 months ago. This is only my advice, so take it for what you paid....I almost bought one off of Amazon. I got to looking around and found the same machine sold directly from
THE Mayflower guy? but was less money and same or better machine. So, I placed and order and shockingly had an email confirmation and phone call within 30 minutes to confirm shipping address. Fast forward about 2-3 hours and a fellow on Marketplace I had inquired about his tire machine / wheel balancer for sale accepted my offer! So, I called the Mayflower guy back real quick and he said no problem, and immediately refunded my money. I was shocked and almost bought his anyway. Ultimately I ended up with the 10-12 year old Atlas tire machine and manual balancer. But, if I was looking to do it again and good cheaper used wasn't an option I would not hesitate to go direct to Mayflower. Link is below. I believe he is on the West coast and not great English but not bad.
Tire machines
As for the tire machines, you'll get 100 different answers. But mine is basic, no arms etc. Has a bead blaster but is worthless. I put some elbow grease in it and $50 in it and love it. The manual balancer is not bad. I've only done a few so far. The hardest part was calibrating it in non english translated english if you know what I mean. These lower end home hobby shop tire machines are pretty much all the same.