I've seen loose ones (edit: with no extra parts at all) go for $15-$25, slightly more depending on any extra pieces that might come with it. The Deluxe Set w/ROB included goes slightly into triple digits, and if I recall correctly, Dain had a standing $150 offer on his boxed ROB (not part of the Deluxe Set)*.
(*Dain, if you'd rather I didn't disclose that info, PM me and tell me to remove it, and I will immediately
.)
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