Amazon.com | Restaurantware Bev Tek 4 Inch x 1 Inch Octagon Drip Tray, 1 Removable Grate Coffee Drip Tray - Dishwashable, Octagon Shape, Black Plastic Coffee Countertop Drip Tray, 2 Pieces, For Beverages: Serving Trays
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Buy Wholesale China 1200w Coffee Machine For K-cup Capsule With 1.5lremovable Water Tank And Removable Drip Tray & K-cup Coffee Machine at USD 34.6 | Global Sources
Amazon.com: Octagon Coffee Drip Tray by Hard Black Plastic for Coffee Countertop (4" - 1 Pcs) : Home & Kitchen
Amazon.com: Small Drip Tray (Pack of 2) Tiny Drip Catcher for Drink Dispenser Nspresso Machine Black Durable ABS : CDs & Vinyl
If you need a low profile drip tray for your Gaggia Classic Pro, I believe mine is well designed and a good value. Info in comments : r/gaggiaclassic