A close price is Dell Home's $299.99 with free shipping. If you don't mind a refurb, AltaTac via eBay has one for $99 less.
Of note, DrivePop also offers Unlimited Lifetime Backup on 1 additional machine with the purchase of its DrivePop Unlimited 5-Machine Lifetime Backup for $119.99, or its DrivePop Ultimate Plan Unlimited Lifetime Backup for $149.99.
Note that this used item may be be missing parts or accessories and may show signs of wear. No warranty information is provided.