Stoneaudio Alex Simmons from Stoneaudio tells me they sell NOS LS3/5as, AB1s and spare parts including drive units, cabinets and crossovers.
Stirling Broadcast have NOS LS3/5as from Rogers and the Harbeth "Alan Shaw Signature" limited edition as well as AB1s. Stirling Broadcast, Charter Alley, Basingstoke, Hampshire, RG26 5PX, UK. Tel: UK+ 44 1256 851001 Fax: UK+ 44 1256 851144
Wilmslow Audio have B110 and T27 drive units as well as crossover components.
Helmut Pullmans lists Spendor components including the T27 and B110.
If you manufacturer, sell or support the LS3/5A or know of other sites of interest please email me so I can include links here. I will include your logo if sent to me as a graphical link.