WTB: Used Mad Catz GB to PC and/or Used NDS to PC USB adaptor

[Sarahconner]

Hey all, looking to purchase the above two items second hand.  They are both specialty, sparsely used functions that one presumes would be widely second hand.  I don't wanna pay 30+ for new versions.  Any offers or ideas? 

http://www.amazon.com/NDS-Adapter-Plus-Nintendo-Windows-Pc/dp/B00XVO0I36