Thanks harvey and pakodominguez. My budget is not very high. I'm hoping for under $100. I haven't done a lot of video with my a77ii, but the biggest issue I've had so far is the built-in mic picking up the af movement. It's actually quite distracting. I looked at the rode videomic go. It's around $85. Stereo recording is not necessary, but I'm not against buying one if it's the best option.