Unfortunately only a few John Steed replica items are available online.
Return of the Cybernauts
of the computer card with vital signs of Steed used by Paul Beresford
Replica of the falsekey
used by John Steed in the episode The Cybernauts
also available here
John Steed's red card as used in different episodes of series 5 and 6.
Replica ofJohn Steed's security pass
from the series 5 episode They Keep Killing Steed
Excellent fanmade replicas can be found on the website : Avengerholic
It looks like it's now soon possible to buy some of the items (October 2020).