For more information and to purchase online:

The Complete First Season
http://www.amazon.com/exec/obidos/ASIN/B0013XZ6U2/ref=nosim/happydaysonline3-20

The Complete Second and Third Seasons
http://www.amazon.com/exec/obidos/ASIN/B00B4HM4GG/ref=nosim/happydaysonlin3-20