re: What is the best “cheap” Red Dot sight?

For me, cheap means good quality and a reasonable price. If you buy something poorly made with a crummy warranty, you defintely don't get off cheaply. Check out Riton Optics. I have 3 of their Red Dots that I picked up at their last sale, and I couldn't be happier. In fact, I'll be training with them this week on my pistol-caliber carbines. I know they are having a big Labor Day sale that starts Friday, so check them out. Save some money and get a good optic.
Right now their 1 Tactix ARD (my favorite) is $99! I paid more than that! I put their 1 Tactix RRD on my Crossbow for pig hunting.