cyclesector.com but you have to contact them. DIego is the owner, you can even say "Ed, the Brazilian guy from Australia" sent you 'cause I honestly have exchanged more 30 emails with the guy. Nicest bloke ever! I just bought a full system from him too. Should get it in a couple of weeks!

His website doesn't show the Leo Vince for my bike but he had no trouble getting it as well as a few other bits I needed. All at EXCELLENT prices.
The 'Unlimited' Slip on for that is extremely cheap everywhere atm. If Diego doesn't have them anymore, hit me up again cause I know of a couple of other places that have them. They're stainless steel if I'm not mistaken though...
Also, don't go for the price for shipping from his website. It's an VERY expensive quote. When email him, just say you're worried about shipping costs and bla bla bla and he'll sort you out.