Season 2 is available for digital purchase, allowing you to own the episodes permanently.

Most services offer a "Buy Season" bundle at 15-20% less than individual episodes ($1.99/episode vs. $24.99/season).

For those using the search term to find file-sharing specifics (assuming legal acquisition), here is what the file sizes look like:

If you’re looking to dive back into the manicured lawns and messy lives of Wisteria Lane, of Desperate Housewives