as an international customer I do understand your dilemma and mine as import charges are very expensive, firstly I would like to say that most of the sites in the united kingdom let you know how much fabric is left in stock before you order if there is not enough stock then you cannot place an order this automatically solves the problem, I will either then choose something different or place the rest of the order later and pay twice. As a business owner I know the temptation is to try and bend over backwards to please the customer but you will just tie yourself in knots trying to do this set your policy and stick to it email them and is they don’t reply then it tough you did your best you can’t please all the people all the time, and if your site is set up so that the customer can see how much stock is left then they have been made aware and it is then there choice if they want to wait and pay twice