Diaper raffle at baby shower

So I've been seeing woman talk about doing diaper raffles at their baby shower and I thought it would be a great idea but my question is what would be the prize? I just finished talking to my fiance about it and he asked the same question I had. Im a first time mom so ive never had a baby shower before and i would love if we can get as many diapers as possible....What kind of prize would u guys give?