#dupes .a great DUPE for the MAC 239 or SIGMA E55 is the ELF shader brush. The quality is not as good, but it does the job. I buy multiple ELF shader brushes just to have them available. This SIGMA retails for $9 (which is not bad for a quality brush, and are considered the DUPE for MAC brushes).
Probably my most used foundation brush, for me its the perfect softness vs density, gives a beautiful finish ... Sigma F80 - Flat Top Synthetic Kabuki This exclusive flat top synthetic kabuki was designed to deliver a flawless makeup application. The Sigma Makeup F80 is a buffer brush that can be used to blend powder or liquid products. The short and dense bristles make it easy to buff your liquid foundation. Made of Synthetic Sigmax HD filament.