...else replace(sug_retail,right(sug_retail,2),50) end as NewPrice
or for the full version:
case when right(cast(round(((itw.lst_cost) +3) * 1.43,2) as decimal(8,2)),2)> 50 and
right(cast(round(((itw.lst_cost) +3) * 1.43,2) as decimal(8,2)),2)< 95 then...