No coupon for this drive - it's a geek special. I considered it a while ago, but just didn't like the aesthetics. Of course, for $38.xx it's the cheapest FW/USB2 3.5" box I've seen.
Now, the Metal Gear Box...that's a pretty drive case. I've got the USB2.0 model, and it's great. One thing to note is that the external power supply has a mini-din style connector and a laptop-like power adapter. I suspect the powerbrick can probably power 2-3 drives, if you had a Y cable with all pins through (5V@2A + 12V@1.25A). Currently mine doesn't play nice with the FW/USB PC Card in my laptop, but I think that's the fault of the interface card, as it works just fine over the built in USB 1.1 port, albeit at a snails pace, and is rock solid with my desktop USB2.
The metal gear boxes are small - 8.75 long (standard) x 4.75 wide (nice) x 1.2" thick (wow). Actually, they're officially 1.5" thick, but the screws at the four corners stick out .15" each. My point is that it
looks much smaller than the 1.5" it's listed at. I just wish I knew whether it had one or two FW ports (for daisy chaining). And, damnit, it's just the best looking drive case I've seen. Period.
Metal Gear boxes:
FireWire + USB2 for $56.99-10%=$51.29
USB2.0 Only for $39.99 - 10% = $35.99
The 10% off is via coupon codes widely available, such as at chubby billfold. In fact, I believe if you strip off www. and .com from the cubby billfold website address, you'll have the right code to enter ;-)