For many kids, the dream of working on a Disney Channel show or movie may seem like a fantasy too good to ever come true. But the reality is that if someone is determined enough and willing to work hard, anything is possible - even acting on a Disney show! Every person who ever worked one of the networks shows had to start somewhere, from the big famous stars right down to the bit role players and background extras.
The network still conducts talent searches in various cities each year, and most are open calls where anyone within a specified age range can attend. And it does not matter if they are signed with a talent agent, or if they have had previous acting experience - although taking acting classes and doing plays can help tremendously.
In addition to the annual general talent searches, DC shoots various shows and movies in cities outside of Los Angeles, and the casting directors sometimes hold open casting calls for specific roles in those cities. Examples are the High School Musical movies which were all filmed in the Salt Lake City area, and the Camp Rock movies which were all filmed in the Toronto area.
As far as any fees or costs associated with DC talent searches, open casting calls, and auditions - there are none! Auditions are always completely free of charge to attend. The only exception is for extras. Disney Channel always contracts out to extras casting companies to hire the extras for their productions. The individual extras casting companies often charge a small fee that may cover photo imaging, administrative costs, etc. This fee is commonly about $15 - $30.
Be aware that there are several unscrupulous websites operating that "scrape" or steal free Disney auditions and casting information from legit websites and use that information to lure people into signing up for a pay-subscription website. They NEVER uses pay-subscription websites for their casting needs, speaking roles or otherwise. Disney Channel auditions, talent searches, and casting calls are always available completely free of charge. You can read Child Actor LA scam prevention advice to learn more in this regard.