I am not a beekeeper, but I belong to the Quekett Microscopical Club - a long-established society for amateur (and some professional) microscopists.
You might be interested to know that the Club is having a "bring and buy" fair called "Microscopium" at St Stephens Church hall, Watling Street, St Albans on Saturday 20th October, 10.00-16.30. If any of your members was interested in acquiring a secondhand microscope or related equipment at a reasonable price, this might be a good opportunity.
Presumably you have an e-mail system for passing on this kind of information to members. With thanks.
Yours, Mark Shephard