Hi Anthony,
All Volumes that are out of print on disc are available from Scotflight.
The web site pages are running a little behind until they get confirmation that disc stock has been depleted.
Iain G. is happy to send out a Paypal Purchase Invoice to anyone needing a volume between the time it goes out of print and becomes available via the shop pages.
At today's date 4/4/16 I believe the following are 'out of print', Volume 2, 3, 7, 9 and 10.
Regards,
Tony