Just till September, so get it while it's hot ( or something. ) And it's only 5.0, so doesn't come with the 5.5 bug fixes. But hey, it's free.
http://www.download.com/Bryce/3000-6677_4-10574334.html?trid=446713850
http://www.download.com/Bryce/3000-6677_4-10574334.html?trid=446713850