I doubt that the (Thunder?) would be willing to part with Robert Swift before he returns from his injury. They have pretty high hopes for him as their big man, and of their few young big men (Sene, Petro, Swift) I believe he, despite his injury, is probably the most valued for this upcoming season.
Ridnour on the other hand, obviously his value has dropped. I am guessing a team could get him for a draft pick (2nd rounder) and player 80 cents on the dollar. However, I don't think the Celtics have the chips to acquire anyone of real value, which is unfortunate.