Sorry no deal posted yesterday cause nothing really good in stock. Steiner Rapid Dot 556 Prism Sight is on sale for $399. Its in stock as of this post. It has a 3x, 4x and 5x capability. Seems like a pretty good deal to me.
https://palmettostatearmory.com/steiner-t536-5-56-prism-sight-8798-556.html
https://palmettostatearmory.com/steiner-t536-5-56-prism-sight-8798-556.html