I was surprised to see that the price is only $13.00. You could charge more in my opinion. I normally am not seeking a bargain when my purchase is affiliated with a group that I have a strong affinity for and when the proceeds are going to a good cause. Most of my past purchases of charitable t-shirts were in the $20-$30 range.

Perhaps you will test a higher price for the next iteration and share the results in true HN style.