Anyone interested promoting the BSS can now purchase T-shirts with the BSS logo. They are made on demand by BSS member Martins Gills through his “Cat in Space” online shop. Various logo versions, shirt colours and sizes are available. Use this link for direct access to the collection: https://cat-in-space.com/collections/bss. Martins has kindly provided the discount code “BSSoffer” which can be used during the checkout process and provides a reduced price of £13.70 including all taxes and shipping.
You may also be interested in this list of BSS books and publications.