Board dealers here will tend to have a better price.  Is there a reason why you are wanting a rail system that is not even with your upper receiver?  For a little less money, you can get either the YHM 2 piece ($110), or the MI 2 piece ($130).  I would consider either of these a better choice primarily due to them riding even with your flattop.  

I've used an Eotech for quite awhile, and when I used the YHM rails, it was nice to be able to hand the Eotech off the front and have it supported, as opposed to hanging in free air.  The MI 2 piece are machined a little nicer, but both work well.

Here are a few pics......



old configuration, I didn't stay with a cord on the light for long.....