J&R offers the LaCie Triple Rugged 1TB Portable FireWire 800 / USB 3.0 External Hard Drive, model no. 301984, for $169.99. Coupon code "ORANGE" cuts it to $159.99. With free shipping, that's $0.16/GB and the lowest total price we could find by $8, outside of the price below. It has two FireWire 800 ports and one USB 3.0 port; it's backwards compatible with FireWire 400 and USB 2.0.
A close price: Amazon has it fir $161.77 with free shipping.