Some online books on Aeschylus’ Agamemnon I’ve found after a quick search: please add others if you find them - will be helpful for the reading group!
You can only post 10 links per post, so here’s part 1:
Comments on the play
Peile:
http://archive.org/stream/agamemnonaeschy00aescgoog#page/n80/mode/2up
Headlam & Pearson:
http://archive.org/stream/agamem00nonofaeschaescrich#page/176/mode/2up
Raeburn & Thomas (google books preview only, won’t fully display all pages):
http://books.google.fr/books?id=8lFoLIYg0ecC&printsec=frontcover#v=onepage&q&f=false
Sidgwick:
http://archive.org/stream/aeschylusagamemn00aescrich#page/62/mode/2up
Conington footnotes:
http://archive.org/stream/agamemnonaeschy01conigoog#page/n32/mode/2up
Adler:
http://archive.org/stream/notesoncertainp00adlegoog#page/n8/mode/2up
Felton:
http://archive.org/stream/ag00amemnonofaeschaescrich#page/72/mode/2up
Kennedy footnotes:
http://archive.org/stream/agamemnonaeschy00kenngoog#page/n94/mode/2up
Paley:
http://archive.org/stream/agamemnonaeschy08aescgoog#page/n60/mode/2up
Verrall:
http://archive.org/stream/agamemnonofaesch00aescrich#page/n71/mode/2up