Free: Contests & Raffles.
You should get the S$W M&P Compact instead, it has better grips, looks nicer, and in my opinion a far nicer gun for the same price.
the sub is definitely a little easier to conceal, they make the .45 xd with a 4" barrel and a grip thats a half inch shorter than the service model. that half inch doesnt seem like much, but my g23 is a half inch shorter grip than my xd service, and its a noticeable difference in carry.. if it's to be a carry gun, get the "compact" grip .45 or a sub..