From this page you can order your G.D.O. replica. The prop comes as described on this page, with two installed Velcro straps for wearing on the arm. Straps can be easily removed for display, or left in place.

You have the choice of the regular battery or upgrading to a new rechargeable LiPo battery with built in USB charging port. This upgraded battery will keep the G.D.O. light shining brighter for longer. This is very helpful if you're going to wear the prop with your costume, but might not be necessary if you plan to keep the prop off for most of the time.