WordNet (r) 3.0 (2006):

at any cost
    adv 1: regardless of the cost involved; "he wanted to save her
           life at all cost" [syn: at all costs, at any cost,
           at any expense]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "at any cost":
   at all, at all costs, at all events, at all risks, at any price,
   by any chance, by any means, by merest chance, come what may,
   despite, even with, ever, if at all, in any way, in despite of,
   in spite of, irregardless, irrespective of, live or die,
   rain or shine, regardless, regardless of, regardless of cost,
   ruat caelum, sink or swim, spite of, whatever may happen,
   whatever the cost, with