For more information and to purchase online:

One Day at a Time - The Complete First Season
https://www.amazon.com/exec/obidos/ASIN/B00008EYBH/ref=nosim/happydaysonline3-20

One Day at a Time - Season Two
https://www.amazon.com/exec/obidos/ASIN/B078DDYR7R/happydaysonline3-20

One Day at a Time - Season Three
https://www.amazon.com/exec/obidos/ASIN/B07B63ZH86/happydaysonline3-20

One Day at a Time - The Complete Series
https://www.amazon.com/exec/obidos/ASIN/B075DSLWGF/happydaysonline3-20

where are the rest of the seasons of this series?