I got a confirmed price on postage per shirt now... we have...
USA - £2.25 regular post (un-trackable)
USA - £2.25 + £4.50 signed for (guaranteed)
EUROPE - £1.25 regular (un-trackable)
EUROPE - £1.25 + £4.50 signed for (guaranteed)
Prices based on weight so 3 shirts regular post to the USA would be £6.75 and if you wanted that guaranteed it would be £6.75 + £4.50