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From your link -

"The SPINx1 is a one channel isolated digital potentiometer intended for spindle control. The SPINx1 takes three TTL level signals, PWM, DIR and ENA and has four isolated...

China. Banggood.

They have the basic stuff at unbeatable prices. And what was not valid a couple of years ago, now is: they are top notch.

Yeah, pretty much what Chaz has said, I also have a 2000rpm spindle and usually cut delrin using cutters from 4mm up to 12 mm. I normally cut around 6mm depth @ 600mm/min. I never use coolant, or air...

I use APT for common stuff - https://www.shop-apt.co.uk/

Although if you want anything delivered before Christmas, you'll need to order before 12 tomorrow, as they shut until the 3rd.