It'll cost £10.57 for me to mail to Portugal recorded, or £5.42 unrecorded. So I'll sell for £50 if you are happy to risk unrecorded delivery, but it's your risk if it goes astray. Or £55 if you want recorded delivery, which will insure it for £50 in case it goes missing.
To be honest, you may be better off ordering one direct from WNW, with free delivery. Not sure what the VAT police are like in Portugal, although I've just seen the VAT rate is 23%!?