<p>These might work and a very cheap solution:</p>
<p>[Amazon.com:</a> Howard Leight MAX-1 Foam Ear plugs Uncorded NRR33 (20 Pair): Home Improvement](<a href=“http://www.amazon.com/Howard-Leight-MAX-1-plugs-Uncorded/dp/B0033YLEGO/ref=pd_sim_hpc_2]Amazon.com:”>http://www.amazon.com/Howard-Leight-MAX-1-plugs-Uncorded/dp/B0033YLEGO/ref=pd_sim_hpc_2)</p>