In case anyone is looking for a dot sight, Aim Surplus has Vortex Strikefires on sale for their Labor Day Specials. Red and Red/Green versions available.
Vortex StrikeFire Red/Green Dot Scope
Just a heads up - if you're looking for .22 mags for you S&W M&P 22, they are now in stock on 44mag.com - if price is an issue don't bother. They want $50 each for the 12 rd mags. I think the site said it would take about 3 weeks to ship