There are a lot of 2nd hand zines for Blake's Seven Please see these pages:
Condition: New
Type: Photo
These are 14 photographic slides of Blake's 7. They include shots from the show and publicity shots.
Condition: 2nd Hand (Good Condition)
A4 duplicated Horizon zine
Condition: 2nd Hand (Middling Condition)
Slash - (Age Statement Required)
Condition: 2nd Hand (Good Condition)
Black and white cover with drawing of Avon, Blake and Vila
Condition: 2nd Hand (Good Condition)
Condition: 2nd Hand (Good Condition)
Type: Book
This is a 192 page paperback book by Tony Attwood. It's "the definitive handbook to the BBC TV series". It contains some black and white photos. It was printed in the UK in 1982.
Condition: 2nd Hand (Good Condition)
Type: Book
This is a 191 page paperback book, Project Avalon by Trevor Hoyle. It was printed in 1979.