you could always value them at $0 and label it as "broken mics". i've sent an md player out that way. another way you could do it would be under value the merch if you label it as a gift. i can't recall off hand, but customs has a threshold price that they let through w/o duty/taxes if it's a) a gift and clearly labeled as one and b) under a certain amount, i think it's like $20-something. i originally bought my mics in this manner through a willing seller.