Try Ebay?

Not quite 600 watts but we have 2 consew csm1001’s that are great. We bought them a few years apart one on amazon and the other from a local dealer. Prices were pretty close, shipping was faster from Amazon.

I've always been happy with Gregg at Keystone Sewing in Philly.

I have ordered and installed 2 off Amazon. Each servo was about $125 with shipping. One was for a Juki, and other for a Consew. Amazing difference and definite improvement.