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If you're not too picky, or feel like putting a little sweat equity into it, you can get used flat files from local government surplus auction, architectural firms, other frame shops going out of business, etc.
I have two sets I'd love to sell..........................not sure where you are at since you didn't fill out your profile. These are some heavy beasts, shipping would cost a fortune.
Wow, after looking at the link Denny posted I have a killer deal. One of mine has 25 drawers and I only want $500 for it. The other one is a 2 piece modular w/15 drawers, 5 of them being extra deep. I better get these on Craigs list..............