One of the best comedy series ever imo. John Lithgow's performance as Dick Solomon is Just hilarious and and excellent supporting cast. Didn't get this when I was younger, but watched it from the beginning a few years ago and loved it. Series 6 goes downhill a fair bit. but for all six series', I think this is an incredible deal. I just bought it for £28 the other week from a merchant seller on Amazon and I thought that was a great deal.
Third Rock From The Sun - Series 1-6 - Complete [DVD] £22.37 del @ Amazon