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Costco has Feit single pole or 3-way dimmer switches. The come with faceplates.
Online there is a 4 pack for $ 31.99 and in store, there is a two pack for $ 15.99.

http://www.costco.com/Feit-Electr…85122.html

https://www.costco.com/Feit-Elect…85122.html