New Books for Class

I am a Language Arts and Social Studies teacher for grades 6-8 in a small rural school in North Carolina.  This year I would like to read some new books with the students that incorporate our Social Studies curriculum in a fun and engaging way.  I want my students to understand that History is a story, and it is exciting- full of characters and conflict on every page!

I am looking to order book sets for my students, 25 copies of:
My Brother Sam is Dead by James Lincoln and Christopher Collier
(either) Hidden Oracle or The Lightning Thief by Rick Riordan

I would like to order these books as soon as possible from a reputable bulk bookstore that I have used before and was pleased with the company.

I would be very appreciative for any help that you may be able to give.  Thanks!