Official OS X Mavericks .app Installer from the Mac App Store. Un-archive the zip archive and you will get the app Installer. A bootable ISO or bootable USB ...
You could try allmacworld.com and search for 'Mavericks'. This downloads in less than an hour. However, it doesn't have a valid signature, so you have to ...
Create a bootable installer for OS X. With OS X El Capitan, Yosemite, or Mavericks, you can use a USB flash drive or other removable media as a startup disk ...