I think the point is 'works like clockwork'. And as the other user said, I'm not prepared to test out your service if you require a registration and sign in before I can see anything about it.

There is also http://camelegg.com for Newegg

Those 2 sites are probably the most I purchase from, however generic is nice for the other non-popular stuff!

Another cool addon is Hoverhound: https://addons.mozilla.org/en-US/firefox/addon/newzon/ I can see how low it has ever been vs just a price drop, and it prevents me from buying on newegg when it sees a lower price on amazon