GIN means "get it now" there is a set number that the lister has set up at the top where you place your bids. If someone would use the GIN option they would recieve 100 box tops and they automatically win the auction instead of waiting till the end of the auction and just placing bids and only winning 10 box tops. Hope that helped explain it. If you still have questions plz feel free to ask. Thanks & good luck if biddding :)