Marketmaps can be downloaded in three formats:

There is No limit and No credits are required for downloading Marketmaps.

You can download Marketmaps by navigating to the Bluebox page, hovering over individual Marketmaps, and then clicking the required format button.

You may also download bluebox by going to your preferred feed by searching for it in the global search bar, then choosing Market and then bluebox in the left pane. As seen in the image below, you will now see the download options on the right side.