Have to clean out some things in my apartment, so I'm offering them up here before I place them on eBay.  PM me with any offers or questions - I accept Paypal.  Prices include S&H.
- One pair of GP-Wiz Eco 49-Way interfaces (no-solder versions) - devices 1 and 2.  $40 shipped for the pair, includes USB cables.   Never used - went in different direction with joystick, still one of the best encoders for 49-way joysticks for the software's ability to digitally restrict your joystick for 4-way, 2-way, 8-way, etc. games.
-  One pair of universal coin mechs.  $15 shipped for both.  Bought these, modified, for my coin door, but the Happs door I bought wouldn't take these.  Will register most coins or .984 tokens. 
- Steering Wheels:
 Logitech Force Feedback Steering Wheel for the PS2.  $55 shipped Great for Grand Turismo series.  Has a USB connection, but I honestly haven't checked to see if it was interfacable on a PC.  
 Thrustmaster Nascar Pro-Digital Steering Wheel$40 shipped. Works great with PC games - not tested with MAME too extensively (but shouldn't be a problem).  Comes with pedals, plug, and the wheel has 4 buttons and a two-way shifter built-in. 
I am also thinking about selling my Dreamcast.  It includes 4 controllers, 2 VMUs, a rumble pack, cables, demo discs (with Swirl) and 7 games (Soul Calibur, Crazy Taxi, Virtual Tennis, Jet Grind Radio, Tony Hawk 1 & 2, and Chu Chu Rocket).  Make me a offer and if it's worth it, I will sell it.  Shipping will be around $10 ~ $15.
PM me if interested.  Thanks for looking.