Through February 3, CafePress is offering free shipping on orders of USD50 or more if you use coupon code VDAYSHIP. (Unfortunately, this offer is only good on purchases within the USA; shipping elsewhere will be charged at normal prices.)
In response to the question of "Who gets the profits from merchandise sales?", the answer is "Nobody, because there is no profit. The costs in the Armadillo Onboard Store have no markup; they are simply what CafePress charges us."