The LaCie 1TB hard disk Quadra (model no. 301881U) with eSATA 3GB/s, USB 2.0, as well as FireWire 400 & 800 connectivity options is available at MacMall.com for $114.99.  That's $35 off the list price of $149.99, and FREE shipping is included making this the lowest total price we have seen on this hard drive anywhere.  FREE shipping is included and sales tax applies for residents of California, Tennessee and Wisconsin.  This hard drive is compatible with both Mac and Windows based systems, and it includes LaCie Backup Assistant software for saving files in one click. 

Amazon.com has the Seagate Expansion 1TB desktop external hard drive for $79.99, which is $24 off the list price of $103.99.  Get 1.5TB of storage space with the Western Digital 1.5TB Elements desktop hard drive, now $98 down $15 from the original price of $113 at BHPhotoVideo.com.  If you require more connectivity options, the Western Digital 2TB My Book Studio Edition II hard drive with Quad interface has been reduced by 40% from $319.99 to $189 with FREE shipping at BeachCamera.com.