How much is it to record in a recording studio?

Prices will range depending on location, quality of the studio, with/without an engineer, skill of the engineer, etc. The best way to find out is to call your local studios for rates.
Rates will often be offered in at least two ways: Hourly and project. Hourly, obviously, is a set rate per hour, sometimes with a discount for several consecutive hours (such as booking for a whole day). Project rates vary and aren't always available, but are typically negotiated with the studio depending on the project.

Set up a budget of how much you're willing to spend on the project and call your local studios, see what they can do for you.

Usually, if your not all that familiar with recording; I would suggest trying out your local studio's, or even a small school guerrilla recording set-up, you don't want to go and spend amazing amounts of money just because its a renowned studio, check out your local towns and small cities.

Most of all, when all the decisions are made, before you go into a studio, reherse, reherse, reherse. Getting it in the first take will save you tons of money.