I did some searching....didn't find anything cheaper then 320. There is a guy that is selling a brand new one for 300 shipped....he is in SoCal.
I figured for 30 extra bucks.....I'd buy one from a retailer where I could return if need be......just my personal preference.
I'll find the link and PM ya.
I'd just run stock gap......you could run on the wider side of the gap....but I wouldn't go outside of it.....