USB Controller Convertors

[Hawksmoor]

While recently rummaging through some of my stuff packed away in storage I came across a box with a bunch of Boom N64/PSX USB convertors and Smartjoy Plus USB convertors. Pics below:

http://usrweblog.files.wordpress.com/2008/08/boom-psxn64-usb-converter.jpg

http://www.gamestone.co.uk/gradius/guides/usb_smartjoy_guide/00smartjoy_plus.png

How much would these be worth NIB?

[Kitsune Sniper]

eBay suggests a price of $15-30 depending on the day... you might get $15 for each.