Many are actually made of tin, and so are not dishwasher safe.
You can also get disposable ones made of stiff parchment paper (they won’t be fluted.)
You can also get miniature ones, and miniature ones made of paper.
Grease metal ones before using.
16-oz (475ml) coffee tins buttered, lined with waxed or grease-proof paper, and then with that paper buttered as well. Or, a charlotte mould, or a narrow, tall soufflé dish.