Most, but not all, higher end bikes are available as a frameset (frame+fork) but often it's an expensive way to build a bike. Sometimes it works out better to buy a complete bike, strip the components, and rebuild it to suit you. That's how I got my Addict. I bought a complete 105 build in an end of season build, flipped the groupset and wheels and put my own Campy parts on instead. The bike was discounted to about the price of the frameset alone so it was a no-brainer.