Pretty much all the tire joints in WA will do siping in 15 minutes and it costs a couple of bucks per tire. It is actually offered when you buy tires here.
Seattleites are obsessed with this stuff though. Seattle gets aboot three snowflakes a year but most of the population is convinced they need to run on studded tires for six months of the year for better traction.
You sure need better traction from all the studded tires tearing the heck out of the road.... Its sure interesting on a motorcycle!
For some odd reason siping has actually been proven to improve tire wear on a lot of models...