Postage and Packaging "expensive" in the UK as apposed to the US?
It shouldn't be much at all, considering the weight of the item. I'm sure Craig could put them in a bubble wrapped envelope and send them first class, which is no more than 30p. It wouldn't be more than £1, unless he's sending recorded delivery which then bumps it up a little but not so much that it would be deemed expensive.
Shipping from the US is far more costly - both in time and money. I'm not even sure if Craig does sell replacement button membranes :unsure: