Domcomp - No-nonsense domain price comparisons, updated daily
Waatcher - Automatically buy on Amazon at your target price
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Favado - Compare prices at local stores & discover the best deals
Glug Club - Curated offers to help your agency and career grow for free
The Mac Index - Compare Apple product prices in different countries