Yep, as eei said, SJS is probably your best bet. They do DT swiss in packs of 6, but size wise you'll have to go for 276 and 278 if you get them from there. Doesn't matter if you use 276 instead of 277 though.
The single gauge champions are cheapest at around £36 for your build. But if you want lighter, you'll have to pay more.
Yep, as eei said, SJS is probably your best bet. They do DT swiss in packs of 6, but size wise you'll have to go for 276 and 278 if you get them from there. Doesn't matter if you use 276 instead of 277 though.
The single gauge champions are cheapest at around £36 for your build. But if you want lighter, you'll have to pay more.
Sure you got the right lengths, yes?