The cost to return my Chromo2 sample from the US was $9.45 USD. I had to attach a USPS Customs Declaration per Kit instructions from IrelandsDNA, which also says to send the package by airmail or special delivery and "please do not post surface mail". (I could not send it surface mail from California if I wanted to.) Even though the kit was from Ireland's DNA, the return mail address is in Nottingham, England. Ireland's, Scotland's, Britain's or Yorkshire's DNA - they are all part of the same stew. Which does not bother me so long as we get the test result that help our M222 etc. research. Bob Doherty Sent from my iPad