Ending today, Crocs takes 25% off sitewide during its Presidents' Day Sale. (Discounts apply in cart.) Shipping adds $4.99, or get free shipping on orders of $24.99 or more. A couple of best bets, with prices after discount and $4.99 for shipping:
naykedapparel via eBay offers the Hanes Men's ComfortSoft Heavyweight 100% Cotton Tagless T-Shirt in Deep Royal or Deep Red from $3.20 with free shipping. That's tied with our mention from a week ago and the lowest total price we could find by $6. It's available in sizes S or L at this price; other sizes are more expensive.