The EXT/5.3/6.0 larger version of the rotors I just bought were $185 for all 4 without brake pads. If I got pads and then the larger caliper brackets, I'd be in well over $300 if I had gone that route.I got lucky, the EXT set that I bought was marked down to that price on a black Friday sale. Dunno why slotted only cost more than drilled AND slotted. Less labor and machine time to make em right? I mean come on!
And the only thing I can think of as to why slotted only rotors across all brands are more expensive than D&S, is perhaps the "performance" over drilled and slotted, being they have more surface area and pads bite into them more. I can't think of any other reason really. They should be priced about the same in my opinion.