Not that complicated. The anchoveys are about 70p the squid is £1.99/kg frozen of which you only need two in a six egg mix, the fruit flavor is about I don't know but a tub or pot lasts for ages as you only need a little, same with flavor enhancer and fish meal is about £18 for 12.5kg you need not add green lip mussel extract. It all works out with eggs around £3 ish per kilo which is not a lot maybe less. Bird seed is a base mix.