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For electronics: Mindfactory, Galaxus, Coolblue, alternate, Jacob, Proshop, alza, computeruniverse.

Caseking and Alternate.de for PC components.

All of them are good for PC components :) But right, I forgot Caseking.

Idealo for larger selection and comparison

Idealo and Geizhals are price comparison sites and nothing else

FYI Idealo is part of Springer (Bild), Geizhals belongs to Heise (c't, iX)

Thomann - for musical instrument stuff

Plus microphones and headphones :)