Yes, I use that ISP as well. They will do lunar billing if you ask for it. The default is ordinary monthly however.
From their website:
The following billing periods are available. They relate to all services on the account. We recommend calendar monthly. Calendar monthly: Invoices are for the whole calendar month from the 1st of each month. Four Weekly: Invoices cover a 4 week period, the exact starting week can be adjusted if required (e.g. to align with salary or benefit payments arriving). Prices are based on 23% of our monthly rates for each week billed. Lunar monthly: Invoices are issued each full moon for the period to the day before the next full moon. Prices are based on 97% of our monthly rate for each lunar cycle. Yes, we really do this and we really have customers that use it. Quarterly: Invoices are for Jan-Mar, Apr-Jun, Jul-Sep, and Oct-Dec. We can adjust which month the quarter starts on if necessary. See note below. Annually: Invoices are for the whole year from 1st Jan. We do not normally provide annual billing. We can adjust which month the year starts on if necessary. See note below.
John