You don't even need the CD, you can get the files from:
ftp://ftp.freebsd.org/pub/FreeBSD/re...6/7.0-RELEASE/
You'll need at least the kernels/ and base/ directories, the others are optional.
Or you can make your own stuff by running ``make release'' in /usr/src/release/, useful if you want to make a CD for STABLE or CURRENT.