MAC Sun, Tan and Repeat is a warm duochrome with a frost finish that is limited edition and retails for $17.00. In comparison, Natasha Denona Calypso Blue (05M) is a warm duochrome with a sparkle finish that is permanent in palette and retails for $29.00.
Natasha Denona Calypso Blue (05M) is 85% similar — it is more shimmery, darker, cooler.