OS X Lion is now available on a USB thumb drive for installation without the need for a broadband Internet connection. Just plug the drive into your USB port and follow the instructions to install. There is 2 downfalls to the USB drive. Users will not be able to re-install using the Lion Recovery Disk Assistant, a utility that duplicates the recovery partition onto an external drive. You will have to rely upon the USB stick. The second downfall is that the price for the USB drive is $69. [Link]
OS X Lion is also available for a lower price as a digital download from the Mac App Store for just $29.