OK so I dug in and found:
A guy in New York who can do
rash guards, fully custom sublimation (
http://www.smart-sportswear.com/ )
$31 per piece, minimum order of 12.
$29 per piece, If I was to order between 30 to 100 pieces
I didn't price shipping.
A guy in Pakistan is quoting me (
http://www.zeegoodint.com/ )
$16.50 per piece up to
$16.00 for 100 pieces
$15.25 for 200 pieces
Shipping from Pakistan is approx $160 to $190, all figures in USD.
Both these people have been very good to talk to so far, however I am just pricing so I can't vouch for the quality of the goods without ordering something first obviously.
These are just quotes based on teh images I sent them for the Peterborough Moon Pilot rashguard design picture here:
Both companies saw the graphic and said "No probem.".