NDS 4 in Round Drainage Grates for Pipes and Fittings 1-1/2-in L x 4-1/2-in W x 3-in or 4-in dia Grate in the Outdoor Drainage Accessories department at Lowes.com
PVC Floor Drain Cover for PVC Pipe | Metal Grate Drain Covers — GarageDrains.com
Amazon.co.uk: Drain Covers
Drain Covers & Drain Grates at Ace Hardware
4-5/8" Cast Iron Grate Floor Drain Cover - Hard To Find Items