Panasonic - Parts and Accessories - Cordless telephone handset Guide. - Use this guide to look up handsets compatible to your telephone and where to purchase.
Panasonic KX-TGFA30EM Additional Cordless Telephone for KX-TGF320 - Black : Amazon.co.uk: Electronics & Photo
PANASONIC KX-TGFA30EM ADDITIONAL Handset £22.99 - PicClick UK