How can I add a field to a content type which will accept a price value in the format of a currency?
UPDATED ANSWER:

using Views field rewrite:

on the field in the view setup, in the "rewrite results" section of the editing modal select the checkbox "Rewrite the output of this field" then scroll down and open the fieldset "REPLACEMENT PATTERNS" and use the pattern there to rewrite your field in the above textarea. as an example to put a "$" in front of the users uid I used $[uid]



CCK field prefix:

You may just want to use a field that is for currency but doesn't actually include the currency symbol, so it can be saved as a number, which allows for better sorting. Then using views you can set a prefix to a displayed field of the desired currency symbol. This may only work with CCK fields.