I recently bought off ebay - a set of 10 by Di2 for $99 and saw these manual ones Good luck
http://www.ebay.com/itm/Shimano-Ultegra-ST-6600-2-x-10-speed-Flight-Deck-shifter-levers-/322591644888?hash=item4b1bf5dcd8:g:mg8AAOSwrf1ZZ65E
Graham Wilson
USAT Level III Elite Coach
http://www.thewilsongroup.biz
http://www.ebay.com/itm/Shimano-Ultegra-ST-6600-2-x-10-speed-Flight-Deck-shifter-levers-/322591644888?hash=item4b1bf5dcd8:g:mg8AAOSwrf1ZZ65E
Graham Wilson
USAT Level III Elite Coach
http://www.thewilsongroup.biz