i bought exam cram network+ question book which (is not an exam cram) but it has about 500 questions regarding the network+ exam, which was kinda helpful.
i would say from my personal experiance the network+ exam is overated. it is a gd foundation cert to have but is not difficult to pass. i was hoping for lots of osi q's etc (because i have had it drilled into my head from my degree) but when it came to the exam it had about 2 q's on the osi. but i think like the comptia exams i have took it wouldnt be that difficult to pass aslong as you have a decent brain upon your shoulders.