3. Extra Chargers
They probably get a standard 10% discount. I mean if you or your kids (if you have any) go to school, then you qualify for an educational discount. Some companies are registering for employee discounts. Probably most Government employees qualify for a Government employee discount.
If you work for a company, ask HR or someone if they have registered for an Employee Purchase program through Apple.
iPads are not discounted through these programs.