Where ever you get them I think you'll want it local so that you can have them re-siped later. Not a good idea to sipe all the way down the first go around, the tread will likely tear out. The Duratacs are great for the first half of their life. Then the majority of the siping wears off since it only goes halfway down. After that it seems like the tread compound starts to harden so along with less siping it has less grab as well.