For UK owners - Halfords appear to have stopped selling gallons of concentrated screenwash - they only sell diluted gallons for 4.98 and I seem to remember the concentrated stuff costing around 6 quid (working out to around 1.50 per diluted gallon for decent cleaning/frost protection). It may be penny pinching but I hate being ripped off! How much to BMW charge for a gallon, or what about alternative sources?
Tim