1) You can't get something CNC for that.
2) Harbor freight (1.5K mill linked to below) doesn't sell tools, they sell tool _kits_. If you're not prepared to disassemble, align, and otherwise fix all the stuff they busted, you're screwed. I'm a half-owner of one, I know.
3) Tool pathing is still expensive / highly skilled. At your price point, you can't just turn a 3D model into a path that a mill can make.
4) Design constraints are different for the two. You can't mill internal voids.
None of which is to say I think the current batch of filament deposition printers are adequate... I've got one of them too, at our Hackerspace in Gainesville. Once they get the plastic printers sufficiently precise that they can turn out e.g. kitchen appliance replacement parts, we'll have gotten somewhere serious.
But your combo requires a bunch of skill to operate, and skill-less object production is kind of the point.