The Pioneer drives are pretty nice. They are quite fast, dependable, about 60 bucks each, and burn dual layer DVD at 4X the last time I bought a couple.
If you have a DVD drive somewhere you can always image the disk too. There are several free utilities out there that will create an iso, mds or bin. Even many cd/dvd burnig apps can image it. Then there are several different ways to transfer it to the machines. If you actually put the image on the hard drive you can mount it with one of many virtual cd/dvd rom driver apps, such as Alcohol or Daemon tool. The demo of those is like 30 days and fully functional.