Anyone have a general idea what a NIB Reactor Kit would be worth?

Bought a box of misc paintball parts from an auction, and it came with a Reactor Kit.

Not looking for offers. Thats for the "for sale" thread later. Looking what people think I should ask for it...

Oh, and *wave* to all the old-AO crowd. I think it's been 4 years since I've logged in. :o Still have my Tequila eMag and pumpmag.