To contractors: Where should I buy kitchen cabinets?

We had a house fire. Our kitchen is going to be replaced; and we are looking into kitchen cabinets. We once had a contractor who told us that we shouldn’t buy kitchen cabinets from Lowe’s/Home Depot/retail, and should instead buy them from someplace else. I just can’t remember what that someplace else is….I think it was something like a lumber something or other. While I’m going to contact the contractor again, I’m looking for everyone else’s info.

Thanks!