COLUMBIA, S.C. — A sales-tax break the Legislature gave Amazon in 2011 expires Jan. 1, making South Carolina the last state to collect among those where officials cut similar deals with the online retail giant.Taxing Amazon’s in-state sales could add tens of millions of dollars to South Carolina’s coffers in 2016, said Max Behlke, the National Conference of State Legislatures’ manager of state and federal relations.State Revenue Director Rick Reames declined to give estimates beyond saying, &ldquo …