Sorry guys nothing I can do about it, that's the way Tindie works (This may change later when I have time to build my own webshop or something, but I just don't have the time for that yet). On the plus side I buy a lot of the components for each build in USD so in real terms I don't actually loose 2 conversions.
For now best to use Tindie as is unless it's wanting to purchase several at once,I will look into ways of improving this over the summer, any ideas or pointers appreciated..