I can see wanting immediate delivery for: RAM, hard disks, DVD drives, cables, mice/keyboards, AC adapters ink/toner/consumables AA/AAA/9v batteries ce

I can see wanting immediate delivery for: RAM, hard disks, DVD drives, cables, mice/keyboards, AC adapters ink/toner/consumables AA/AAA/9v batteries cell phones (when original is lost/destroyed) .. but it depends on the size of the markup/premium. In my mind, the comparison is to asking my assistant to go buy the thing, or buying it myself, so I think about the cost of driving + opportunity cost (e.g., if I send the receptionist, they may not buy the right thing, and then someone else has to answer the phone, or calls go to VM and maybe we miss something important) .. I'm answering from a business context, not a personal context. Personally, I can probably wait, or just go buy the thing myself if I'm in a hurry.