Shimano a410 compatible brifters
You can basically use any 7 speed Shimano brifter except for 7 speed dura-ace (which had a different cable pull). All the 7 speed Shimano rear derailleurs (road/mountain) except of dura-ace have the same cable pull. And you're fine with road front derailleur compatibility within Shimano. 

The current Shimano brifter that is compatible is the Shimano ST-A070, from the Tourney line. The Microshift SB-R472 also works.