What is hot

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Now that we are bracing for the cold cold weather i thought I would ask this question.  What is hot in the papermoney world. 

i was checking out a 1 diget radar and it is selling so far at $1000  That is wild.  It is already $350 above Charlton book. 

What else forum members do you find is just going way above book.  It may be a certain prefix, error note. 2 digit radar etc. etc etc.  It may even be a certain year

what are your thoughts

Cheers

Polarbear