Pinterest's "Buyable Pins" has been extended to the Android platform, having originally launched on iOS.

Pinterest Ecommerce "Buyable Pins" Rolls Out to Apple Devices in US [webmasterworld.com]

I did find a widget on Pinterest that was not anywhere else, but the maker seems to be out of business.

Separate issue: Of course, if you don't want your images to appear, read our thread on How To Stop Pinterest scrapers stealing your images [webmasterworld.com]