Holy shoot I came to this thread to post the same thing!
How was your hunt for 7? I went through two on Amazon. Both look like a dickhead 11th grader kept it in his backpack for eight months. I just gave up and kept one.
For what it's worth, way back around Mayish I emailed Dark Horse about reprinting 7, and issueing 8. They said they would do 8 eventually, and 7 will not be reprinted. It's been over a year since the last standard volume that would comprise 8 came out, so I don't know what's taking them so long.
Do you have the TMNT Legends collection? Would you mind listing the contents? I swear the previous collecctions, between the Fantagraphics two volume set and the first Dark Horse Saga, are missing at least one meet up where Usagi and Leo meet for real. Fantagraphics ended with Usagi confused by them, and next time I saw them in a Dark Horse Saga he met all four again, but seemed to know Leo as a friend. Or something like that. Something was missing. I want to know if that collections worth it on its own.