Built these for my MarkK RS22528As, you'll be hard pressed to find a more bulletproof cabinet. Laminated 1/2" mdf to make 1" panels and bracing. Bracing full interlock and dadoed, recessed and angled binding posts, 2" OC703 damping. Cabinets are coated in resin, never got to a finish.
Build log on PETT.http://techtalk.parts-express.com/forum/tech-talk-forum/40265-markk-s-rs22528a-as-surrounds-build-thread
Price: Whatever they are worth to you +shipping. Cabs probably weigh 20ish lbs each.