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Or you could just use a shitty cheap webcam and take the lower bits of each pixel (or one pixel of each 8x8 block if the compression is bad).

The amount of randomness per second webcams generate is pretty insane, it's more than enough to feed the seed of a crypto PRNG function like Fortuna.

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There are plenty of decent sources of entropy, like webcams and sound cards. However, they all add parts we don't need, and they don't take any care to design with security in mind. Eventually, a good open hardware TRNG should be cheaper, more reliable, easier to use, and more secure than any of those solutions, IMO.

> they all add parts we don't need

What are you worried about exactly? Space? There are really really tiny cameras for smartphones that are mass-produced, and they are very noisy, which is perfect.

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