As mentioned above FOC has a 10% off sale so you're saving anywhere from $74-$80 depending on the model you're looking for. Down side is, they only have 3 models to choose from. With the RM07 adjustable @$799 and the RM01 @ $749 non-adjustable. Tenda seems to have more of models to choose from including the dual-illuminated ones as well and their starting price point seems to be cheaper.
From the research I did at the time, these were the two lowest prices I could find. I doubt you'll find a discount on Trijicon itself, but rather a storewide discount. I ended up getting the RM07 at Tenda since at the time, I had just missed out on the 10% FOC sale the last time out.