Hello capt. 
 
I'm not sure if this information is usefull because we live in a different country but for a simple old javanese mendak i'd go to large collectors events. if you want a more rare sumatran or bugi etc.  that's a problem. you would have to know the right people. Sometimes it is possible to buy a keris without a scabbard but with a nice correct mendak so you can switch. 
Just curious > for what kinda keris are you looking? 
 
good luck
		 
		
		
		
		
		
		
		
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