Boots are offering Glucojuice on a 2 for £1.50 basis at the moment. Normally £1.29 a bottle. Also same (2 for £1.50) on glucotabs which are 0.95p each at Boots.
I only use the glucojuice and I can't find it cheaper than amazon normally - still expensive there so when it's on offer I go for it. Glad you've found a cheaper source of the tabs though