I've never done it, but I don't think there is anything too particularly magical about the $250 OE one.
One thing it does have that a generic one might not is a check valve which attempts to maintain fuel pressure when the pump isn't running. But I don't think this is a terribly important part of the system - it might make the car start 1/2 second quicker when you turn the key on, then wait for a few seconds before cranking.