Volvo S80 satnav disk (UK)

Just bought a Volvo S80 T6 (1999 vintage) but the sat nav disk is
missing, is this available anywhere or would I be better off buying a
tom tom?

EM87

 

I found this link:
http://www.automotiveforums.com/t357237-rti_volvo_sat_nav_cds_for_sale.html

 

Thanks but no reply from the email and it was posted 4 years ago. Looks
like I may have to pay main dealer prices....

EM87