Hi
CD prices have gone up this year-the cost price to Councellors has gone up twice to my knowledge.
£37.50 doesn't sound too bad maybe slighty higher than average, many C's now charge more for bars and tetras and I think the 'usual' price is £1.65 per pack, £1.85 for bars/tetras. So perhaps the £37.50 includes some of those too. Water flavour £6.50ish, mix a mousse £2.75ish.
C's can of course charge what they like, though there are guidelines advised by head office. Some C's provide a much more supportive service than others so don't go by cost alone. Also I have heard some C's charge a one off joining fee, this is definitely not the norm and in my opinion should be considered carefully before you part with your money.
Are you 5'7" or taller cos if so you ought to have 4 packs a day.