I can't seem to find it now, but not so very long ago (and over a period of several months), there was someone selling these "unique & strong" large fish bowls. It even had this "amazing" handle like structure for fish to enjoy and swim through.
Well on closer inspection, it turned out to be one of those very large plastic water bottles that they place on water cooler machines - that simply had the top bit cut off !
So I wrote to the chap and said those rather appear to be ordinary water bottles. He had the courtesy to reply but skirted around the fact that that's what it was.
Bless.
But at £10 or so (+postage), they most certainly sold.
Just goes to show what people will buy !