Oniedasuzuki.com or crotchrocket.com will most likely be the cheapest place to get them.
I got them from Onieda and they are GREAT. I wish I would have done this earlier.
There is also a guy from the UK that makes a spacer from delrin I think. Its black. He is on here from time to time as well. He goes by chewy22. He has LOTS of aftermarket goodies for our bike. He also is obviously a SV rider as well.