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The cheapest motorised filter wheel is the Andy Homeyer one, which is still US$499 (more than the DMK camera). He may have availability problems though.
Then you still need to buy RGB filters. I'm getting the baader ones at the budget price of AU$170. I simply can't justify spending any more than that on filters. I hope the wavelength cutoffs are the same.
The Atik does look like it could be motorised by someone with DIY skills.
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