Recently, Google has replaced their Keyword Tool with their new Keyword Planner tool. This new tool provides very similar data, but presented in a new way. This tool can be found under the Tools tab. The first consideration is determing why you're using the tool. Google provides three choices, as seen in the screenshot below:
Most times, you will want to choose the first option, Search for keyword and ad group ideas.
To begin searching for keyword ideas, and the associated search volume, you'll have to enter the appropriate targeted keywords, and/or your desired landing page, and/or your product categories. It's recommended that you try a few search variations to get your desired results. After making these selections, you can then further refine your results by drilling down to a specific location.