if they need to be samples of actual humans speaking with their actual mouths you might get lucky searching for a directory of words from an english as a foreign language site
otherwise have you tried the at&t text to speech thing, or just google itself?
( brb Monkhouse Stampede, Fri 13 Mar 2015, 2:48, archived)

thank you... that will probably help a lot
(Wankle-Rotary-Engine -pronounced 'Throat Wobbler Mangrove', Fri 13 Mar 2015, 18:59, archived)