Where do you look for rare records and pressings ?

Reliable sources, people that got or can get real things. Not ebay, discog, craig moerer, garbage bins, goodwill, yard sales,thrift shops etc.
Miles Davis, Mahavishnu Orchestra, Dead Can Dance, El Camaron/Paco de Lucia etc -  pro and test pressings, including first release Japanese. Couple of Pink Floyd and Deep Purple maybe.
I have a few, they sound vastly superior. Best way to improve the sound.