I saw all 3 seasons on sale for $15.99 each at the Thousand Oaks store.

http://forum.dvdtalk.com/showthread.php?t=493907

And they have all 5 seasons.

I finished out my collection (already owned season 1) last week with this deal. To be honest, though, given the lack of features and the fact there are only two-discs, this should be the price (or around like $20) that it should've been in the first place...