Well, they would not even let you pay for it and overnight it to you then send the old one back for another drive so you could break even? It's an utmost priority if you have all common hardware to keep replacement disks on site no matter who you work for or company.
Which is why you'll always find spares of the most commonly used drives & components on the shelf in my tech room at work. SCSI, SATA & even IDE. All ready to be pulled, "in the event." Master images (w/ 2 spare's pre-imaged) are kept for certain plant PC's where downtime can run in the tens of thousands of $$$, per day, when we're down.