from calumet via amazon
I have been on the market for a wireless flash trigger and had my eye on this one. These can fire your canon RT flashes without the need to buy receivers. Unlike the Canon ST-E3-RT, these have AF assist beam for low light and this deal is almost 1/3 the price as Canon's trigger. These have been listed on B&H and Adorama for $165. This is the lowest price I've seen. Showing only 6 left in stock but direct from Amazon is $123.08 which is still not a bad deal if you miss out on this one.