Amazon Is Testing Rounded Buttons. That's a big deal for UX Design | Newlee
Amazon.com: Drops Natural Purple Mother of Pearl Round Buttons, Two Holes, Arched - Diameter 15 mm - 0.6 in | Quantity per 1 Button - 1 Piece
Amazon.com: Cozyel Badge Punching Die Round Button Mold with ABS Slide Badge Maker Part Compatible with Button Maker Button Making Machine (φ37mm 1-1/2")
Amazon.com: YAKA 80Pcs 1inch(25mm) Sewing Resin Buttons Round Shape 4 Holes Craft Buttons for Sewing Scrapbooking and DIY Craft Multicolored