They are in 128kbps, but most were converted from flac audio (or 320kbps). So... enjoy!! :)
-----------------------------------------------------------------------------------
2007 ~ Sayonara Zetsubou Sensei Character Song Album ''Zetsubou Kayou Daizenshuu''
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjck1RZnFneUVId3M
-----------------------------------------------------------------------------------
2007 ~ Sayonara Zetsubou Sensei ED Single, Zessei Bijin
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjbjN6blBZWVNVZEE
-----------------------------------------------------------------------------------
2007 ~ Sayonara Zetsubou Sensei OP Single, Hito to Shite Jiku ga Burete Iru
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjdTRvN0Z1dVZaamc
-----------------------------------------------------------------------------------
2007 ~ Sayonara Zetsubou Sensei Original Soundtrack
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjRTdYSURHOS1zTVE
-----------------------------------------------------------------------------------
2008 ~ Sayonara Zetsubou Sensei Kakurenbo ka Onigokko yo
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjSzBFN0hUUjZ0cnc
-----------------------------------------------------------------------------------
2008 ~ Sayonara Zetsubou Sensei Utamono Kessaku Senshuu ''Zetsubou Daisakkai''
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjc1FTLUlTYnZPeTA
-----------------------------------------------------------------------------------
2008 ~ Zoku Sayonara Zetsubou Sensei ED Single, Marionette
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjbTUzQzF3Nkl1U1k
-----------------------------------------------------------------------------------
2008 ~ Zoku Sayonara Zetsubou Sensei OP & ED Single, Kuusou Rumba
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjT0J6Z1lieXFEa00
-----------------------------------------------------------------------------------
2008 ~ Zoku Sayonara Zetsubou Sensei Original Soundtrack ''Zoku Zetsubou Gekiban Senshuu''
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjbFVtLTBkT2N5aHc
-----------------------------------------------------------------------------------
2009 ~ Sayonara Zetsubou Sensei Character Song Album ''Zetsubou Kayou Daizenshuu II''
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjdmQ0MUdGbW5GaHc
-----------------------------------------------------------------------------------
2009 ~ Zan Sayonara Zetsubou Sensei ED Single, Zetsubou Restaurant
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjYlpteHEzZGZUVVU
-----------------------------------------------------------------------------------
2009 ~ Zan Sayonara Zetsubou Sensei ED2 Single, Kurayami Shinchuu Soushi Souai
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjM2dFTF9Eb21fT3c
-----------------------------------------------------------------------------------
2009 ~ Zan Sayonara Zetsubou Sensei OP Single, Ringo Mogire Beam!
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjcGRtaXpLbE52UnM
-----------------------------------------------------------------------------------
2009 ~ Zan Sayonara Zetsubou Sensei Original Soundtrack ''Zan Zetsubou Gekiban Senshuu''
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjcGRtaXpLbE52UnM
-----------------------------------------------------------------------------------
2011 ~ Sayonara Zetsubou Sensei, Moebius Kouya ~ Zetsubou Densetsu Episode 1
LINK: https://drive.google.com/drive/folders/0B5UfljZ67vNjSHc0X2poM0F6aGM
-----------------------------------------------------------------------------------
Any problems just contact with me!! (Sorry for my bad english ...)

Thanks!

You're welcome !! (≧ ◡ ・)

Oh, thanks, I was looking for that!