SIDEBAR: Why I don’t feel bad about sharing these links.
2 of these are out of print and impossible to find. Having shopped around for the best price I could find I still paid $40something for my used copy of Batgirl: Year One, and $30something for a used and falling apart copy of Nightwing: Year One. Those are ridiculous prices.
DC refuses to reprint these books, which would make them more accessible and less expensive for their readers. Besides, any money spent on the books right now goes to people who are reselling their copies of the book and jacking up the cost. Not to DC.