Slate+Ash Cycles is 50% off (it has been for a few months so maybe just a new price point) and is an interesting, more abstract, granular (and loop) based sample mangler. Not so good if you want total control but for inspiration I love it. Some discussion here: SW DEALS : Software on Sale - #3863 by SouvlakiPlaystation
Arturia EFX Fragments is nice for real time processing. Ableton Granulator III maybe a nice option if you use Live.
Also see Creative Software Mangling Samplers