I haven't updated my VendorMaster addon in a while, so I'll have to confirm that all features (I don't use the blacklist sell feature) still work properly - though I haven't gotten any complaints! But you can try it out and see:
https://www.wowinterface.com/downloa...dorMaster.html
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh