These anthologies offer a arias for a variety of fachs and allow singers to add to their repertoire as their voice develops.
Royal Conservatory of Music
For singers participating in the prestigious RCM program, this these are the books you will need for the exam. Be sure to look for the new 2019 Edition.
Musicnotes.com is a great website for purchasing single sheet music (CCM, jazz, classical, musical theater) and transposing.