[mvdwoord]

idealo.de tweakers.net/pricewatch .. in my corner of this earth.

There were / are plenty. Google's idea of being the only game in town is mostly marketing for almost all of their products.

[josefx]

geizhals.de might also qualify.

[sho_hn]

Was going to post this: Geizhals is amazing, especially to understand and browse variants of the same product. Their database is wonderful.