I don't really know the going rate for frames at the moment, but £3k sounds quite a lot? E.g. Mercian's are ~£1400. BJ were £600 which is clearly too cheap...
Actually, maybe I'm just out of the loop, it looks like some of Mercian's frames are also around £3k. Just shows how cheap BJ were!
Is there a reason why Argos framesets are now £2995 (they were £1800 a couple of months ago I think)? Do they just not want anymore work?