From this date, these tickets can only be purchased from Leap card outlets (map of them here), loaded onto Leap cards.
If you do not already have a Leap card, you will need to purchase one (cost is a €5 deposit) before you can buy a City Direct weekly or monthly bus ticket.
This applies to the adult, student and child versions of these tickets.
There is no announced change to City Direct's monthly TaxSaver ticket.