HN and Reddit have always been very helpful in pointing out Manpacks' price competitiveness with Amazon. :)

To put it into perspective, using Hanes crew necks (that seem to be a baseline for comparison) you're paying a "discounted" $12.99 for a 3-pack on Amazon. Not including shipping -- or what you pre-pay using Prime -- that's $4.33 a shirt. Manpacks lists them at $5, with free shipping on orders above $30.

If you just don't see the value in not having to think about or shop for the basics, then that 67¢ savings will be the deciding factor.