I have a real nice leather bag, thing takes a beating looks real classy. I'll have to run to my car and check the brand.
I've found needing it so often a good bag is well worth it. This one came with an insert for a 13/15 or can fit a 17 but barely. I have a 15.4 so I run just one insert. It's been a great bag still looks new.
I know not massively helpful till I get the brand for you I just thought i'd chime in remember it's holding a 1-2k + tool don't skimp on a bag.
A quick google and ebay shows a ton of bags, I know the local best buy has them, but marked up you could try them there and buy online.