Amazon.com: Copic Ciao, Alcohol-based markers, 72 color Set A
Amazon.com : Alcohol Markers 80 Colors Art Markers Professional Markers Art Pen Dual Tips Permanent Marker for Adults & Kids, Alcohol Based Sketch Markers for Painting, Coloring, Sketching and Drawing(white) : Arts,
Marker choice: my favourite marker sets for interior/architecture sketching from Amazon — School of Sketching by Olga Sorokina