History: The iBook (Dual USB) was available in four configurations, each with a different optical drive: The CD-ROM model, with 64 MB of RAM, was $1299 U.S., The DVD-ROM model, with 128 MB of RAM, was $1499 U.S., the CD-RW model (available only as a BTO option at the Apple Store), with 128 MB of RAM, was $1599 U.S., and the "Combo" DVD/CD-RW Model, with 128 MB of RAM, was $1799 U.S.