At McDonald's, a Sausage Biscuit with Egg is more than the cost of a Sausage Biscuit and an Egg biscuit combined, so you're essentially paying 50 cents more for the lack of
Sausage Biscuits | Ready to Eat 6 Easy Open Twin pack
Sausage Biscuit Sandwiches with Gravy Recipe - Pillsbury.com