Gin = Get It Now. It is kind of like Ebays Buy it Now option. It allows you to bypass the auction and get the item at the listers GIN price! Hope that helps! :)
The lowest I've ever gotten for a single power disc was over 1500 credits, and Tron is much more RARE. The cheapest it goes for on eBay is 9.00, so I would not accept a GIN lower than 2500 for it. If it goes lower than that at bidding, then I'd have to let it go. But I can't just give it away! I'm sorry :)