As of December 2008 all seasons (1-5) of I Dream of Jeannie have been released to DVD. All seasons are available separately or in a complete boxed set.
Seasons 1,2 & 3 have already been released. Seasons 4 & 5 have not as of yet..
I Dream of Jeannie
Only Seasons 1, 2 and 3 have been released on DVD. It is currently unknown if the remaining seasons will be released.
Presuming you mean released on DVD, as of 02|2013, Seasons 1 through 15 & 20.
There are 243 episodes of 7th Heaven in all.
The contestants for Season 17 have not been released yet.
All 4 seasons (each in 2 volumes) have been released.
Nowhere yet, because only the first 15 seasons have been released.
Teenage Dream?
Crossing Jordan was cancelled in 2007.
It is already released. All six Corner Gas seasons have already been released.
Seasons One through Seventeen & Season Twenty are released on DVD and Al Jean announced in April 2015 that the DVD sets are being discontinued. Seasons 1 through 17 & 20 are the only seasons to be released.