SheIn offers its SheIn Women's Round-Neck Striped Loose T-Shirt in Red/White or Black/White for $9.99 with free shipping. That's $6 off list and the lowest total price we could find. It's available in sizes S to XL, although not in all size/color combinations.

Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the 99-cent fee.