I bought a 500ml bottle back in December'09, it is still available from here:
Web:
http://www.ukcolloidalsilver.co.uk &
http://www.uk-cs.co.uk
Email: mailto:sales@uk-cs.co.uk
Tel: 01803 313147
Address: UK Colloidal Silver Ltd, 1 ''Chapelstones'', Torquay TQ1 4UN
..............for now!