Buxom Posh Purple is a cool purple with a frost finish that is permanent and retails for $12.00. In comparison, Sleek MakeUP Simbad's Seas is a cool purple with a frost finish that is limited edition and retails for $9.99.
Sleek MakeUP Simbad's Seas is 85% similar — it is more shimmery, darker, cooler.