There are some other options:
Substitute blood - https://nordicfoodlab.wordpress.com/2014/01/07/2013-9-blood-... - I am not sure why people don't do this but maybe they are squeamish. Food grade blood is cheap and readily available from slaughterhouses and butchers.
Buy some chickens
I don't substituting blood for eggs is a widely-known option. I'd never heard of it before now, and I have a somewhat above-average amateur interest in cooking and food science.
I don't substituting blood for eggs is a widely-known option. I'd never heard of it before now, and I have a somewhat above-average amateur interest in cooking and food science.