I've got a sloped keyboard enclosure here with rounded corners in black and white. You can find them online easily. Very rugged and nice quality. But BIG. I think that counts for many if not most sloped enclosures, they seem to be big.
I remembered some loop enclosures sold by a German shop. Here's the link https://www.musikding.de/Looper-enclosure-30cm Guess you could find similar stuff in the US too.
ODS Pedal Parts
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