Best deals:
K1000s $280 ebay.de
K340s $48 ebay.de
Stax SR 5/SRD 6 $85 ebay.de
modded RME Digi 96/8 Pad $80 head-fi
Koss KSC 75 $25 amazon.de
Beyer DT 531 (NOS) $75 ebay
Rudistor RP 31 $230 ebay.it
Decent Oehlbach interconnects $4 ebay.de
Marantz 2235 B $45 ebay.de
The best deal ever was a set of really decent two years old Magnat floorstanders in absolutely perfect condition, like new.
The company has a bad reputation for their low end stuff, but they do produce very good mid-fi speakers.
Street price new was ~ $1100, and I've got them for $60 via ebay.de.
The seller did even deliver them to my house.
He was a bit depressed about the few bucks he got for them though.
The other side of the coin are the bad deals I was involved in, but that's another story.