Found a new source for Frixion markers : r/sewing

Pilot Frixion Colors Erasable Marker - 12 Color set /Value set Which Attached the Eraser Only for Friction : Dry Erase Markers : Office Products

Review: Uni-Posca Markers - Lynda Heines Fabric Design

The BEST Fabric Marking Pens

Pilot, FriXion Point Erasable & Refillable Gel Ink Pens, Extra Fine Point 0.5 mm, Pack of 3, Black, Blue & Red : Office Products

Pilot Sw-fc Frixion Erasable Watercolor Pen Candy Drawing Pen Color Graffiti Pen - Art Markers - AliExpress

Pilot FriXion Colors Erasable Marker, Black (SFC-10M-B)

Pilot Sw-fc Frixion Erasable Watercolor Pen Candy Drawing Pen Color Graffiti Pen - Art Markers - AliExpress

Frixion Fine Point 0.7mm Clicker Fabric Pen — Quilt Beginnings

Pilot Frixion Colors Erasable Marker - 12 Color set /Value set Which Attached the Eraser Only for Friction : Dry Erase Markers : Office Products

Erasable Fabric Markers - Goheen

Are Frixion pens safe to use on quilts? - The Crafty Quilter