The cost of a subscription varies with the length of time purchased. The longer the length, the less per month it costs.
Presently, the prices available are:
1-Month for $2.00 ($2.00 / month)
3-Months for $3.00 ($1.00 / month)
6-Months for $5.00 ($0.83 / month)
12-Months for $9.00 ($0.75 / month)
All prices are in USD.