Amazon.com: Metal Snap Buttons Silver 0.30 inch Studs for Sewing 8.5mm Snap Fastener Buttons Press Button for Sewing Clothing Sew on Snap Buttons Pack of 50
Amazon.com: 50 Sets Sew-on Snap Buttons, Metal Snaps Fasteners Press Studs Buttons for Sewing Clothing, 3/4" 19mm(Silver)
Help finding quality snap buttons : r/Leathercraft
PRYM Small 4GB S Spring Press Studs, 15mm Brass Snap Fastener Matt Black Plastic Cap No-Sew Buttons for Clothing, Wallets, Clutches, Jackets, Handbag, DIY Leathercrafts, Silver, 50pcs - Walmart.com