For more information and to purchase online:

The Complete First Season:
http://www.amazon.com/exec/obidos/ASIN/B0007IO6PA/ref=nosim/happydaysonline3-20

The Complete Second Season:
http://www.amazon.com/exec/obidos/ASIN/B000A9QKSM/ref=nosim/happydaysonline3-20

The Complete Third Season:
http://www.amazon.com/exec/obidos/ASIN/B000E6ES9Y/ref=nosim/happydaysonline3-20

The Complete Fourth Season:
http://www.amazon.com/exec/obidos/ASIN/B000G6BL7O/ref=nosim/happydaysonline3-20

Season Five:
http://www.amazon.com/exec/obidos/ASIN/B00P9UVDDE/ref=nosim/happydaysonline3-20

The Final (Sixth) Season:
http://www.amazon.com/exec/obidos/ASIN/B00P9UVBPY/ref=nosim/happydaysonline3-20

The Complete Series:
http://www.amazon.com/exec/obidos/ASIN/B00HRUQB5O/ref=nosim/happydaysonline3-20

I own Seasons 2-4 on DVD. I'd love to see the last two seasons get released.