If it's for the your nephew that you posted in another thread, I think it might be a little early for the Leapfrog series. Dr. Seuss and other classics still work.
A couple of my nephews favorites are
Click, Clack, Moo Cows That Type and
Brown Bear, Brown Bear, What Do You See?
Booksamillion is closer for me so that's where I go. I like the additional discount.