No, monthly payment is not available. The Bronze and Silver have Semi-Annually minimum billing periods to help cut down on paper waste and administrative work/time. The Gold plan has a minimum Quarterly billing period.
We recommend you take advantage of one of our pre-pay discounts for semi-annual or annual payment. We do not have contracts at EthicalHost so if you choose to cancel before the expiry date, you will receive a pro-rated refund for your hosting.