Just a "heads-up" for others who might also be on the lookout for 8x10 Polaroid film holders at something less than the $180/each retail price. There are several holders listed separately on eBay at the moment, but the descriptions don't indicate the part number or type. A close look at the enlarged images, however, shows them to be the older, rather problematic 81-05 holders, not the current 81-06 type.
The current 81-06 holders have two little blue release buttons on the long side of the holder with the dark slide facing you. These are used with the 81-09 loading tray, and replaced the original 81-05 holders shortly after the product was introduced due to the problems they encountered with the 81-05s.
As they used to say in Rome, "caveat eBayer". ;-)