Schreiner's supplies all of the major box stores all over the US so just about every plant you find at one of those stores more than likely came from them, there business is 80% commercial this is the reason for growing 200 acres of Iris and moving them every year
I am sure Lowe's bought thousands of bulbs of Sunrise Elergy at a great discount for the volume that they do and that's why you see it priced that way. If it is blooming and is the correct one you found a great deal, but most of the time once it makes it's way into the box stores they mix up the label's not just Iris but a lot of plants.