Picked up some $20 Winchester brand bag at Wal-Mart and it's been great. Slots for 2 pistols and includes 2 mats/sleeves for them to go in. Plenty of room for ammo, ear protection, glasses, etc. It's not overly large but has worked great so far.
Tried to buy a bag off of Amazon and it was a total bust. It's too hard to tell how much some of these will really hold.