#1. No. Only K-12 teachers/institutions and higher education students/teachers/institutions get discounts. Try eBay/used, refurbished (from Apple or a vendor like PowerMax), or the "shop" tab of MacRumors' header for cheap iBook prices.
#2. Search. There is already a thread with TONS of great advice and commentary called "Cheap iBook G4s?!" or similar. It's in one of the sub-forums in "Mac Hardware," if not this one.