What type of gadget to buy for an amateur astronomer?

Get a gift certificate. Or something practical, like a great warm jacket, arctic boots, thermal undies and something to keep warm drinks in.
 
To know what to get you'd need to know what they already have and don't have. Amateur astronomy for the most part isn't really about "gadgets".
 
As an amateur astronomer myself i can say a radio telescope kit would be perfect.

NASA sells "radio Jove" kits. They allow you to lissen to the radiowaves from space, such as Solar and Jovian storms. I'll be getting one myself.
 
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