Cabela's has the Bushnell TRS-25 High Rise red dot optic on sale right now for $69.99. From what I've read and have been told by friends that have them, it's a great optic for the money. The high-rise version is actually $20 cheaper than the standard mount version. It makes so much more sense to buy the high-rise version because you can use the riser mount for an AR-15 platform or take it off and use the standard mount for something with a lower profile. I'll be putting one on my Ruger 10/22 Takedown.
http://www.cabelas.com/product/Bushnell-AR-Optics-TRS-HiRise-Red-Dot-Sight/1580687.uts
http://www.cabelas.com/product/Bushnell-AR-Optics-TRS-HiRise-Red-Dot-Sight/1580687.uts