$300 isn’t much of a budge

$300 isn’t much of a budget, especially if they’re going to be permanent fixtures. But if you’re just looking for something inexpensive and basic you could get a couple of THESE, route them into a BASIC MIXER or COMBINER and run the outputs into your GL2. Or, you could spend a little more and get a DUAL LAV setup from a single receiver and eliminate the mixer and combiner.