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There is a package in most linux distributions (sbcl under Ubuntu).

If you want more precise control over your lisp, look into Roswell. It is rbenv for lisp.

There's a GitHub mirror (https://github.com/sbcl/sbcl), but it doesn't have copies of the binary releases.

If you want a current SBCL but want to avoid Sourceforge, use your distro's SBCL binary (which is probably ancient) to recompile the source code taken from GitHub.

Most distros provide sbcl binaries, but otherwise you're stuck building from the github mirror or downloading a binary from sbcl.org.

apt-get source sbcl