my EI starter kit cost £18 + p&p and there is loads of stuff that should last for ages.in terms of cost, I add 5ml of liquid ferts to my 320L everyday.........TNC costs about £15 for a 1L, so it's not too bad. Will look at the dry stuff when this bottle runs out though.
im currently dosing 80ml of macro 3x a week and 80ml of micro 3x a week with 8ml of carbon every day. sounds loads compared to you