I just downsized for the summer months so only have 3 breeder hens laying. If I have more than 12 to send, they would be the price of 12-but I cannot guarantee I would have more. I got three eggs yesterday.
If by Friday (the day I would want to be paid through paypal) I only have 10 eggs to send, the cost would drop to $20 (but I would send all I have on Monday). Last week I advertised 10 eggs for $20, then mailed 13 eggs out on Monday. $2 dollars per egg based on what I have on Friday.
So you are paying for the number of eggs through Friday (10 or 12 eggs probably), and I send what I collect Saturday and Sunday for free. Due to shipping times, I don't ship any eggs over a week old. I wish I has more to ship because more eggs does not change the shipping price.