You should have bought more, because today you're not getting that for "shouldn't cost more than $15" in late 2019 with a Chinese trade tariff war going on. Hmm.
Here. It's twice what you want to pay for it: $29.99
Amazon.com : Soonpho Flash Diffuser Light Softbox Speedlite Flash Accessories Kit, Color Filter Honeycomb Grid Reflector Diffuser Ball with Universal Magnetic Mount for Canon, for Sony, For Godox Speedlite : Camera & Photo
www.amazon.com
This is discussed
ad infinitum on another photography forum I'm sure we all frequent, too. Gary actively defends his stake, good for him. Whether it's overstepping? Not an attorney.
Then again, Dr Damadian invented the MRI in the '70s but a few unscrupulous engineers stole proprietary tech from a super-excited pioneer who didn't think he's need to protect himself that way, and gave it to their subcontracting boss for a hefty fee I'm sure, and the world suddenly had MRI machines everywhere, and Dr Damadian still has to work for a living instead of living in his lab inventing the Next Big Thing.
There is something to be said for defending what's yours.
Although? Unless it's a model shoot or wedding where your and your gear's appearance matter - in which case, WTF are you doing with speedlites when high-output wireless ETTL DC monolights are under $1000, even under $500 for no-names, these days, you dummy?
But a small soup container from a Chinese takeout works a treat with a little gaff tape if the walls/ceiling are too far to get a bounce. And if it's too harsh, a #4 bleached coffee filter fits perfectly and is suprisingly neutral white. And if one's not enough, 4 will be. Cost? Free for the asking.
(*usually. NYC Chinese restaurants might charge you 0.50 for a soup container with no soup in it.)