Did you order something on our website, but it hasn't been assigned yet? This means we currently do not have enough stock to supply your demand. The assignment follows the principle 'first come, first served'. Do not worry however, as we order new books on a weekly basis. The delivery time for course material should be less than seven days. Note that, in the case you order something just after we placed an order at the printing company, the wait time will be significantly longer.