So I guess the opposite of the "White Whale" thread.
What fossil do you regret buying?
For me it must be the Mioplosus I bought when I first started collecting fossils.
It's an ugly, heavily stained example. And it was quite expensive for what it was.
Whenever I look at my fossil shelf and see it, I think to myself that I should never have bought it.
All part of the learning curve I guess