Here's a link to a page at "Bud's Gun Shop". He does a great deal of business. The prices shown don't include tax of shipping/FFL dealer fee, but there's a .308 in the bunch for ~ $360.00 ... with tax it should come in under $390.00 and then with an FFL transfer fee of #25-$40 bucks she'd be in the ballpark you mentioned.
http://www.budsgunshop.com/catalog/a...lin+X7&x=0&y=0