Need to buy new Keyboard

Bonjour, My keyboard is broken, I need to change it.
I found a keyboard on the store, but there is no technical information :

1 - is it the good model for my CHUWI UBook Pro 12.3 inch ?
2 - the keyboard is $39.90, the shipping is $49, why the shipping is so expansive for a so light product ? Can I have a coupon for that ?

For your information, I’ve sent several emails to and through the store chat with absolutely no answers since 2/3 weeks