Cheap & mono don't really go together, especially when adding on the extras you need - even "cheap" filters & a wheel will cost over $500 new.
For "cheap", the ASI183MM (or similar in other brands) is a tried & trusted performer, though starting to fall a little behind the specs of newer cameras. Watch the classifieds here & you may run across a good deal on a 183MM or 1600MM with filters/wheel
Cheers,
Mark
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