The seller would have to list the other item as a buy it now for an agreed upon price and let you know when it has been listed. They could list it as "for mrshickadance only" and not show pictures. You would buy it and then it would show up on the combined invoice. If after you get your items and you and the seller are satisfied with the transaction,
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.