Köln and Aachen are both full of antiqueshops, though some can be hard to find. Lots of arms/survival dealers have some hones, strops and sometimes straigh razors.
If you're also looking for DE razoers, they sell 'm even at a lot of supermarkets.
and BTW, if you like whisky go to the Lidl and buy a bottle of Queen Margot for about 6€, you'd be suprised at the quality for such a cheap whisky
