Amazon, and even somewhat rare ends up being bad juju for you. Something everyone has tons of, and they will be lowest price. Some say they are a necessary evil. I'm thinking Besoboy is simply Satanic.
Have you priced regular blades yet for that 30mm arbor, maybe that saw is a bad pick? More and more jigs, and set ups to route out Dado's, ALL I am aware of are way cheaper than 600 bux, by far.