Many thanks for expressing an interest in these items. My message was posted last year and I should have updated it because all the Journals and Handbooks have now found good homes, such as with the BAA Archivists.
I noted in the For Sale column in the 2018 February Journal there is a set of Handbooks on offer.
Alternatively, as a BAA member you can download PDF versions of the Handbooks and Journals via the Publications – Downloads tabs on the BAA website. Another option would be to purchase the BAA Journal Archive on DVD from the BAA Shop.