If you WERE going to buy one, most parts stores should carry them... as for pricing:
Autozone's listing is as follows:
Wells EGR - Part# EGR284 $42.99
FELPRO gasket - part# 70149 $1.49
As a member of CEG, I cannot recommend that you EVER purchase parts ANYWHERE without first checking
Signature Lincoln Mercury (CEG members get a discount!) and talking to Bill Jenkins
or
contacting Steve at Tousley Ford (1-800-328-9552, mention his "SVT plan", you don't need an SVT to get the discount.. just merely mentioning the plan nets you about 50% (sometimes more) off..)
Call and price around! The Felpro is a new gasket that you will NEED to replace. (it is REALLY easy to replace the EGR)
Ray