i use envelopes and that is roughly the cost. I just always set them a couple dollars higher because i'm never really sure as each shirt weighs slightly different.
Forgot to ask...wondered if you would take a self-addressed postage paid self-seal poly-bag sent to you for shipping to me if I were to win? I'm finding lots of the listia sellers like the option so I thought I'd see if you did. Thanx :D