Found these with quick search - probably more if you look closely.
I have not bought from these sellers but have bought 5 Regina freewheels on the bay and they've all been in good nick. You just need to make sure that the threads are compatible with your hub :facepalm:
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There are only 13/18's left that are 6 spd but a 12/21 in 7 if that is any good.I will look to see if I have a 13 t top sprocket to convert the 7 to a 6.jm.