Marker Illustrator Brushes, Add-ons - Envato Elements
Chunky Markers - Illustrator Brushes By The Artifex Forge | TheHungryJPEG
Marker Brushes for Illustrator - Design Cuts
Amazon.com : Dual Tip Brush Pens Double Sided Pigment Based(Non Acrylic) Brush Markers 36 Color Art Set with Zipper Case Flexible Brush and 0.4mm Fineliner - Coloring Journaling Lettering Drawing Sketching :
A Huge Compilation of 40 Free Illustrator Brushes | Envato Tuts+