While long term availability seems to be a problem for lots of reality TV shows, usenet or a private torrent tracker like TorrentLeech should work if the show you’re looking for is popular enough. As datacap-free usenet access is usually at least $50 a year ($52 a year for Frugal Usenet + NZBGeek; forgoing the latter would reduce it to $40 a year, but might take a while for several seasons of TV shows since free indexers only offer up to 5 downloads a day each), private torrent trackers would ideally be better, particularly given that they often bundle episodes into season packs. As public trackers have a lower proportion of seeders in comparison, they generally only have the latest seasons of most reality TV shows.