If you're using it as the first character in a line of text, Word likes to
decide you wanted it as a bullet.
Use these recommended settings in Word: http://www.theofficeexperts.com/word.htm#RecommendedWordSettings
In particular, the Autocorrect Settings
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~Anne Troy
If you mean that by typing "$" you are getting a symbol that looks like a
standard bullet (as opposed to the start of bulleted list), check in Tools >
AutoCorrect to see if "$" is to be automatically changed to your bullet. If
this is the case, delete the entry and you should be OK.