For me, I use a combination of all of the above. Some of my favorite bookstores are Half-Price Books and Barnes & Noble (because it has an amazing YA collection!). Also, I discover that our public library here in Norman actually has an impressive YA collection, too! So let me know, where do you get your books? :)
And after you have answered my poll, you should head over to Mina Lobo's blog and sign up for her blogfest! She's celebrating her two-year blog anniversary! Those are always fun! :D
This year, Mina invites everyone to 'resurrect' a blog post between November 8, 2012 and November 6, 2013! She will also give away PRIZES!! :) Head on over and sign up!