Computer optical drives
A good DVD writer should run about $30 bucks.
We like the Lite-on brand, and we have one of these in a computer now:
$29.99 Lite-On IHAS124-04 Internal DVD Writer - DVD+R 24X, DVD-R 24X, DVD+RW 8X, DVD-RW 6X, DVD+R DL 8X, SATA (OEM)
http://tinyurl.com/ylqrnvl
If you prefer one that supports lightscribe:
$34.99 Lite-On IHAS22406 Internal DVD Writer - DVD+R 24X, DVD-R 24X, DVD+RW 8X, DVD-RW 6X, SATA, Lightscribe (OEM)
http://tinyurl.com/yfaavzy
You will need to have SATA headers in your computer, most current computers have them, but you might want to glance over your specs.