The $29.99 all-metal desktop Stirling engine kit is one of the simplest ... sells for $89.99 and is functional when assembled. The model is advertised as being suitable for ages 12 and up.
The model Stirling engine is a staple of novelty catalogues, and we daresay that were it not for their high price there might be more than one Hackaday reader or writer who might own one.
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