A way to configure tiered/volume discounts so that the item price would depend on the number of items being currently ordered or the number of already purchased items plus the number of items being ordered is required. For example we need to configure pricing like that:
1 Mailbox - $10 / Mailbox / month 2-5 Mailboxes - $8 / Mailbox / month 6-10 Mailboxes - $7 / Mailbox / month
Is there a way to achieve it in PBA?
This is a feature request with id #PBA-766 ("Tiered/Volume Pricing"), which is implemented in PBA 6.0. In earlier PBA version such configuration is impossible.