I have two EQ/ notch filter pedals that Im not using. PayPal is preferred.
THD quintet ($85 shipped): Basically a Varitone circuit with a blend knob. It has 5 preset EQ curves, just like a Varitone, and has a bypass switch function.
Ayan Smooth and Slim ($85 shipped): Rumored to be used by John Mayer, this passive EQ tapers the highs and lows of your amp, to help it fit better in a combo setting. There is a bypass function, as well as normal and dark modes.