An external hard drive is supposed to cost more than an internal one because the internal is a bare bones piece of hardware you need to install yourself. No more: Buy.com has this Seagte 400gb drive for $229.95 after a $50 mail-in rebate. New customers can use our $15 off coupon to save more. There is free shipping and no sales tax (except CA) as well. At close to $0.50 a gigabyte, this is very cheap storage that you can use with multiple computers.