There are several different ways of getting Freespace.
Of course, there are still a few copies of Freespace 2 floating around, up for sale on eBay, or maybe lying in the bargain bin at your local computer store - although the latter's pretty doubtful. Freespace 2 has not been mass-produced in the States for several years, so checking places that sell used software is your only recourse. Freespace, of course, has been out-of-print (so to speak) for even longer.
Get it from a friend
Oddly enough, Freespace 2 actually has a clause in the license agreement that states that it's legal to give a copy of Freespace 2 to a friend - as long as it's for noncommercial use. So, be nice to anyone who has it, and maybe they'll burn it for you.
Get it from HOTU
HOTU also has Freespace 2 listed in their downloads. Although this download went down for a brief time in the past, it is one of the most reliable ways of getting Freespace 2 over the internet. Unfortunately, the version included with HOTU is stripped-down. Fortunately, it is possible to correct this. By grabbing the missing VP files from a source such as Fractux's FTP, and deleting or renaming the original "data" directory of the HOTU download, you can bring Freespace 2 back to its fully-featured potential.-
Freespace 2 is soon going to be made available via HLP's BitTorrent tracker. See the main BitTorrent article for more information about this method of distribution.
Get it from another source
There are other sources out there, that may have ISOs of the CDs, the VPs, etc.