General Idea of the cost of the part would be:

$163.40 with ABS
$208.13 without ABS

Prices from http://www.fordpartsonline.com/

Sounds high to me, but just quoting what they got.

General idea of what is involved in the replacement:

http://www1.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/1b/da/13/0900823d801bda13.jsp

Not really sure of what it would cost to replace from a mechanic, but I would say it shouldn't take more than an hour to do. Just a guess.

99 SE V6 Silver Frost 201,592 Miles (Still Running Well)