Airsoft part buying guide

Hi all, I'm a foreigner, I want to buy replace parts for my airsoft gun back in my home country. Unfortunately, the only shop I found selling this parts is this shop "rookie-airsoft", I contacted them but they only accept bank-transfer which I don't have. I try to find it out there at other airsoft store in Bangkok but no luck. Anyone here can help me out ? I'm staying here till this Saturday.