It can be frustrating to buy something and see it on sale for a lower price a few days later. Some businesses will rebate the difference to you if you complain. This was our experience with Dell.
I bought a computer for my son before he headed off to university. We were running out of time, and even though he wanted to buy his own components and put it together himself, we opted for convenience and bought from Dell. We also bought a printer/scanner at the same time.
My wife happened to take a look at the Dell web site the day after placing the order, and the printer's price was $40 lower. Even though we waited for a couple of weeks after the computer and printer arrived to complain, Dell cheerfully agreed to give us the $40.
On the down side, the printer didn't come with a USB cable needed to connect it to the computer. Given that people buy from Dell for convenience, it's hard to understand why the Dell web site didn't at least warn us that we'd need a USB cable and give us the option to buy one with our order.
Expert computer users wouldn't be put off by a missing cable, but imagine some grandparents showing up with a shiny new computer for their granddaughter. It matters a great deal to the grandparents that the computer be put in working order quickly instead of seeing all excitement deflate as the child has to wait for a few days for the computer to be put in working order.
The missing cable wouldn't have been a problem if we had opened the printer box at home. I have several old USB cables lying around. But, we didn't open the printer and install it until we were in my son's dorm room. This may have been poor planning on our part, but Dell played their part in causing this problem, too.
So, we've mailed a USB cable to my son along with a few other forgotten treasures. I give Dell full marks for how they handled the rebate, but their web site could do a better job of protecting the unwary from forgetting necessary components.