Cabelas has RMRs back in stock. On sale for 290, and they have a 10% discount code AND free shipping. 281 to your door after taxes.
http://www.cabelas.com/product/TRIJICON-RMR-LED-SIGHT/2053594.uts?searchPath=/browse.cmd?categoryId=734095080&CQ_search=rmr
And Brownells has their pre-milled RMR Glock slides on sale for 190 to 200 bucks. If you bump it up to $200 with small slide parts, H7L gets 20 bucks off with free shipping
http://www.brownells.com/handgun-parts/slide-parts/slides/front-cut-rmr-slide-for-gen3-glock-9mm-17-4-stainless-nitride-prod107977.aspx?avs|Manufacturer_1=brownells&avs|Special-Filters_1=New
http://www.cabelas.com/product/TRIJICON-RMR-LED-SIGHT/2053594.uts?searchPath=/browse.cmd?categoryId=734095080&CQ_search=rmr
And Brownells has their pre-milled RMR Glock slides on sale for 190 to 200 bucks. If you bump it up to $200 with small slide parts, H7L gets 20 bucks off with free shipping
http://www.brownells.com/handgun-parts/slide-parts/slides/front-cut-rmr-slide-for-gen3-glock-9mm-17-4-stainless-nitride-prod107977.aspx?avs|Manufacturer_1=brownells&avs|Special-Filters_1=New