http://www.aimsurplus.com/product.aspx?groupid=1338&name=Primary+Arms+Classic+Micro+Dot
From their site:
The Best deal in optics just got better! The New Primary Arms Micro Dot gives you a great optic at a great price! Primary Arms Micro Dots come with a removable low profile mount. Add a QD Lever Mount to mount the Micro Dot Sight at AR15 height. One year manufacturer warranty.
*Offer valid through 07/07/2014 or while supplies last!