Will you pay $20 to see a 3D movie in the theater?

Trying to cash in on a new wave of 3D movies, theaters across the country are quietly raising ticket prices up to almost $20 a head.

No official announcement has been made. But theaters owned by Regal Entertainment Group, Cinemark Holdings and AMC Entertainment are upping prices by as much as 26% starting on Friday, mainly for 3D offerings such as the blockbuster hit "Alice in Wonderland," according to the Wall Street Journal.

A few examples of increases: an AMC theater in Danvers, Mass., is raising 3-D ticket prices are jumping more than 20% to $17.50 from $14.50, while the adult admission price for a conventional film will remain at $10.50. A 3-D Imax movie at New York City's AMC Loews Kips Bay will cost $19.50, up from $16.50.

Movies are enjoying a surge in attendance, with movie attendance in the U.S. and Canada up 5.5% in 2009 to 1.42 billion, the highest level since 2004. Ticket sales this year are up nearly 10% from the previous year.

You can check yourself if 3D movies in your area are receiving a price increase at online ticketing sites like Fandango or movietickets.com.