dont think there that much, under 1k, i got mine secondhand from Mat fmp
cage is from Mark Fish, comes with a full fitting it, 4 plates to weld into the car and 2 plates to sandwhich the rear arches.
Mine is not welded in tho, mark bolted it in though the floor with longer bolts as i didnt want it welded + iv only got the rear in at the moment, full cage going in before the summer.