They pop up on eBay every so often, haven't seen any recently though. I would find an ebay seller that's parting out a bike and ask if they've got one they haven't disassembled yet.
Mine leaked for a bit but after I got it running a bit it stoped. I mean if you dont have one new ones are like 112$ try a junk yard I ordered 4 carbs gaskets kits from them and they took 2 weeks but I got them... http://partsfinder.ridenow.com/fiche_section_detail.asp