Picked up first pressing of Merciless "The Awakening" LP for 40$ some years ago, and Sarcófago "INRI" first press for 35$ around the same time. Both in great condition. Not insane bargains really, but the climate for this stuff was just as ridicilous then as it is nowadays.
Haven't made any real bargains since. On the other hand, alot of new stuff one buys gets sold out shortly after it's released, and all of a sudden the same stuff is sold on discogs for twice (or even three times) the initial price. Sure, I sometimes understand why people pay these amounts, but it fuels the whole circus. Paying 30 to 40$ for an early Vanilla Recs tape, I get that. But 30 to 40 bucks for some tape on Posh Isolation released three months ago?