Many sub-$30 DVD-RW drives claim DVD-RAM compatibility; do a search on Newegg for DVD-RAM.
Then if your OS supports DVD-RAM natively, it should appear as any other removable device - you can read it, format it, etc. Notably WinXP required packet writing software to support DVD-RAM, and it didn't like anything but FAT32 formatted media [Note: This information is based on my experience several years ago, so things might have improved]. Apparently Vista and OSX have native support.
Vista even lists my cheap Samsung drive as DVD-RAM, rather than CD/DVD; don't have any DVD-RAM media to check on functionality.