Yeah, all my All-Clad are D3 or D5. The D3 is their baseline series (three layers of metal - stainless on the outside and inside with aluminum between). The D5 has 5 layers and is fancier, but more expensive. For 97% of home cooks D3 is totally fine. I got D5 because that's the factory seconds set my parents gave me for our wedding. I don't really notice a difference between the two.

The homeandcooksales.com website is All-Clad's factory seconds site. I think I've only bought factory seconds (aside from a roasting pan) and the damage to each piece is totally cosmetic. Most of them don't even look damaged at all. The only pan whose damage I can see was just a tiny scratch on the cooking surface. The sale ended a week or two ago.

Made In is a newer competitor to All-Clad and of similar quality.