With Easter Eggers you are rolling the dice as to what color egg you are going to get. There is no way to predict with certainty what the egg color will be because the EE is a cross of two birds and may have genetics from several different breeds in the two different birds.
With hatcheries it's even more uncertain that that because they buy the eggs and hatch them. Therefore they are not involved in the breeding process and thus have no idea what they are even buying.
I have one EE that I will be putting all four of my true Ameraucanas over in an attempt to develop a tri-colored Wheaten Ameraucana that is similar to Bev Davis' Wheaten Marans. My EE lays a pastel purplish-pink or pinkish-purple egg now. I am guessing I will get some chicks that lay a blue egg from her, some that lay a green egg, some that lay an olive, and maybe even some that lay pure brown.
Btw, I'm not sure what you mean by "Lavender" but it is likely an off-blue. I don't know why I haven't done this yet but one of these days when I get a real nice purplish looking egg from my EE, I have going to crack it open and scrap the outside to see just what it doing that but my guess is that it is a brown overlaying the blue egg.
God Bless,