Amy - go and buy some very cheap facewashers to use at home. That is the best way to save money! Save the flashy breastpads for when you are going out.
I have even been known to turn up to peoples houses with a facewasher in one side, and a cloth pad in the other. Or even better - my bra still unclipped, and my boobies very uneven Oh well - I know I'm doing something good for my child (And for my wallet!)