NOTE: If you are looking for a cheap scraper, you will not find it here. There are basic reasons why this is the case. No cost or commitment to message me, but $5 gets only you consultation and is factored into the price of your project! CONTACT ME BEFORE BUYING :)
So you're thinking you need a scraper, huh? Well, scraping tools are fine, but you're at the mercy of the target site's ability to ban you, as well as their ability to change site's design instantaneously.
Many large sites that my previous clients wanted to retrieve information have an application programming interface (API). This means you can query data a lot faster, and not be at the mercy of the target site's front-end design changes. As well, they are typically quite happy to provide you free, or near-free, API-level access.
QtC++ applications can integrate with APIs and is available for cross-platform and mobile use.
The .NET Framework and Visual Studio for Windows' integration with a web service/API.
Here are some other popular sites that have an API:
Contact me today for better-than-a-scraper solution :)