The best replacement for deflator is cpi.

The best alternatives to deflator are rated as following:
★★★★★  cpi
★★★★  cpi inflation
★★★  cpi difference
★★★  real gdp
★★  cpi which is better
★  consumer price index
★  price index
  cpi for inflation

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Speaking about deflator, one probably shouldn't forget about nominal and real gdp.

Other search terms related to deflator and their ratings are:
★★★★★ nominal and real gdp
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Google Trends

Scale is based on the average worldwide traffic of deflator in all years. Click on graph for more.
deflator
cpi
cpi inflation