"monthly price" is correct and usable in written English.
You can use it to express the cost of something that occurs on a monthly basis. For example, "The monthly price for this subscription is $15."
Fifteen of the cities showed monthly price declines.
For those households, the $9.99 monthly price will apply only for a two-year period.
The import-price index is the first of three monthly price gauges.
Shudder's monthly price is $4.99 not $5.99 as we initially reported.
Services like Mozy and Carbonite offer space, sometimes unlimited, for a monthly price.
You're getting exactly the same battery life and convenience of Verizon's MiFi — for two-thirds the monthly price.
A common problem when renting is not opting to have the bills included in the monthly price of the property.
Walmart's monthly price is now more than 50 cents lower than Netflix's, and about 15 cents lower than Blockbuster's.
Still, buttressed by a $2 monthly price increase, the company was able to beat Wall Street's estimates.
The OECD has constructed an index of the monthly price of 20 hours of Internet use, at peak and off-peak rates (see chart).
For many low-income families, child care costs can easily be double the monthly price of food and even exceed the monthly housing costs.
