When I first saw the post about the on/off switches breaking I thought I would order some spares as someone found a replacement switch. My pack of 10 has turned up today after about 1 month from Amazon. As I only need 2 spares, I have the remaining spare and will offer them to others. Just send me a message, I will provide you with my postal address and then you can send me a letter with a return letter I will post back to you.
I am only offering this to UK addresses as I don't know how you would buy a UK stamps from outside the UK.