Cheapest ones I've been able to find start at about $85 and go up to the
top, the very top!*

So I went to Hobby Lobby and bought a resin bowl for $4, drilled a hole in
the bottom, and I was good to go. Flower pots would seemingly also work;
they already have a hole in the bottom.

Am I missing something?

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* Examples (best be sitting if you look)
http://www.flooranddecoroutlets.com/...ves-sinks.html