kjsdhf omg you can get them online as ebooks - that's what I did to finish the series. ;_; and I so know what you mean. I reread them again recently, with an adult mind and omggg they are so dark.
When I tell people that my favorite book series is Animorphs they are like, "... wat? that's a nerdy kids book isn't it." and I'm all, "NOT JUST NERDY. BUT AMAZING. OMGFGF GO READ."