The tax-free day is August 9, below are the prices of the shirts without tax:
1-2 Shirts per family: $15 each with Tax $13.86 without tax
3-4 Shirts per family: $12 each with Tax $11.09 without tax
5+ Shirts per family: $10 each with Tax $9.24 without tax

Due to high demand, there might be a limit on shirt sales on Orientation Day!