You must have been reading my mind. I've been successfully using Earth Carpet Spartan Grade A for decades, but last year I tried Earth Carpet's Madison Parks on recommendation from my seed salesman to see if it might work better on my well drained sandy loam soil. MSU has been switching to Turf Type Tall fescue in an attempt to reduce maintenance input (fertlizer, water, pesticides).
LaCrosse Seed near the airport is the regional EarthCarpet turf seed distributor. If you have some sort of business tie, you might be able to purchase from there at wholesale. https://us.dlf.com/la-crosse-seed/turf/brands/earth-carpet/earth-carpet-products
