click Boxes (3,312 items) (under the Boxes, Enclosures, Racks category)
Use Control-Click or shift click to select all of the Plastic materials (I’m assuming you dont want metal)
Check the box for 'in stock’
Click ‘Apply Filters’
Then start looking through the Size/Dimension for something that will fit.
There’s a 5.99x3.24x1.38, or 6.18x3.7x1.42, or 6.1x4.6x1.37, or…
there’s also Mouser.com, with over 6,000 enclosures, like maybe 5.9x3.15x1.18, or…
Tons out there, and that’s only two places to look.