Seasons one and two are both still available, both for streaming and as brand-new DVD sets. (In fact, I see that the DVD sets are on massive sale right now! Must share the news!)
Season three is not. You can buy used copies of the season 3 DVDs, and they tend to be very expensive. For streaming, if you didn't buy season three back when, Amazon says: "Our agreements with the content provider don’t allow purchases of [season three episode title] at this time."
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Seasons one and two are both still available, both for streaming and as brand-new DVD sets. (In fact, I see that the DVD sets are on massive sale right now! Must share the news!)
Season three is not. You can buy used copies of the season 3 DVDs, and they tend to be very expensive. For streaming, if you didn't buy season three back when, Amazon says: "Our agreements with the content provider don’t allow purchases of [season three episode title] at this time."