A service that does essentially the same thing as Camelcamelcamel is Keepa, again specifically for Amazon, and with international coverage.

Keepa has extensions for all the major, and a few minor, browsers which watches as you browse items on Amazon and allows you to set price triggers as you shop. They claim to track and have price histories on over 700M (!) items. I hope you never test that claim, but there it is.