I think you can be pretty certain that priced copies did not originate from Book Clubs. Yes, one or two may have slipped through the net; but Book Clubs would almost always sell copies (regardless of origin or intended market) without prices -regardless of how this was done.

So, while I agree that un-priced copies (clipped or genuinely unpriced) may have come from either market; priced copies almost certainly did not come from book clubs.

Does anyone have any real concrete evidence that Book Clubs regularly distributed books with prices still on them? If not, then I think it can be said with a fair degree of certainty that priced copies are not Book Club (and are therefore trade).

BH