There are two types of bracelets and links you can get. There is a stainless steel variety which is much more expensive and then there is the silver-tone variety which is much more affordable.
A stainless steel starter bracelet with the lasered Mickey heads on it is $18 and stainless steel charms to add to it vary in price from about $15 for the simple single charm ones to about $50 for the double charms with dangles.
The silver-tone starter bracelet is $6 and silver-tone charms for it are $3. The selection of the silver-tone charms was pretty limited when I was looking for them (in February). You could get a Mickey, Minnie, birthstone Mickeys, and alphabet charms. I don't remember any others.
I saw the more affordable variety available all over the place. Any of the larger gift shops where they had jewelry displays will probably have them. The stainless steel variety may only be available where they sell the finer jewelry.