Well .. one competitor is this: http://www.ebay.com/itm/Lighting-St...ighting_Parts_Accessories&hash=item4ac4ca2fcd for $40 + shipping. Not all speakers have top mounting holes, but many do.
Agreed .. just giving a reference point for pricing for a net similar? functionality.A very nice find. I have seen some people fashion those themselves, but haven't seen a completed one available. The issue with that design is that it adds the weight to the top of the speaker thereby making it top heavy and unstable. Having the arch allows the weight to be transferred down to the connection point.
I use Ultimate Tele-lock stands when my tops are by themselves .. K&M adjustable sub poles when mounting over subs.