I bought this trackball for my MAME cabinet, but ended up going with the 3" Version instead. So my loss is your gain!
This is a brand new unit from Happ Controls (the very best in the industry). This retails for $147.65 USD from their website ... I'm looking for
$80 CND!!!
If you're an Arcade fan like me ... be sure to check out John St. Clair's book,
Project Arcade and I'm sure you'll be inspired like I was!

Here's the website from Happs (except I'm selling the Serial & PS/2 Version)
2-1/4" TRACKBALL WITH USB AND PS/2 INTERFACE I am including the Trackball, Interface board, PS/2 & Serial Connectors, and 3 Microswitches & Push Buttons!
(MAME BUILDERS PLEASE TAKE NOTE: BEWARE OF TRACKBALLS THAT ARE SOLD WITH REGULAR ARCADE WIRE HARNESSES WITHOUT A PS/2 OR USB PLUG THAT GOES DIRECTLY INTO YOUR COMPUTER! IF YOU BUY A REGULAR ARCADE TRACKBALL YOU MUST THEN BUY AN INTERFACE BOARD LIKE THE ONE ULTIMARC SELLS FOR $56 SHIPPED TO YOUR DOOR! THAT MAKES ANY ARCADE TRACKBALL YOU BUY $56 HIGHER IN PRICE!)My item includes the interface board!!!!I'm in Brampton/Mississauga Area ... so Canadian MAMERS, save on duty charges!!! Or if you're in the area, come and pickup to save on shipping!