You can get all of these that you want for free...
if you can use them.
Go to your closest large "breakfast" restaurant(s) and ask the manager(s) to save them for you rather than throwing them away. I have a stack of them that I use for hatching lockdown in the incubator. They're 5x6 compartments, so they hold 30 eggs.
ETA BTW, they can be cut to any size easily with scissors.