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Ages ago, you could get the original MOTUC figures dirt cheap save for a couple of them (Sorceress, King Randor, Scare Glow, and Clamp Champ). But they've all gone up in prices to the point that it's cheaper to track down the early 00s reissues.
As for the modern figures: if you can't find Origins, the Super 7 figures are a decent substitute and still worth picking up certain ones as Super 7 has several characters (Shadow Weaver, Evil Seed) that won't likely get a release in the Origin line.