I searched Google and Amazon for you, and found results based on the franchise that VH1 has started, but nothing that met the actual series of episodes that aired on the network. The VH1 message board for one ‘decade’ of the show (I Love the 70’s board) says that they aren’t available to own yet. Hope this helps!
Whoops, looks like I posted too soon. On the 80’s message board, another person asked about this too. Looks like you might have to go look for torrents, or just wait until Viacom has all the commercials, music, ect worked out with their legal team.
Off topic, but have you seen the newest ones for 2000–2007? It’s seems a little soon too me. But I love the series, DH and I rewatch them on VH1 Classic all the time.