Internet error in your favour
This isn’t the first time (and almost certainly not the last) that a product has shown up online for an inaccurate price. Apparently a Tesco employee is responsible for the slip up, and several Xbox 360 consoles were ordered (one customer apparently ordered almost 40 of them!)
If the error goes undetected passed shipping then the company must agree to the sale at the price, however I suspect that this was noticed in time and those who ordered might be lucky enough to get (just one) Xbox. I’d say it depends on the number of people that placed an order at the incorrect price.
I remember this happening with TVs many years ago in the early days of the Internet, and in this case the company decided to make a loss. I don’t think many orders were placed and it was certainly good publicity! Tesco effectively did this (although intentionally) with the digital SLR camera I bought earlier this year, and sold it at a small loss for just 24 hours. The orders apparently took months to fill, but I managed to get a Jessops store to price match - I was in the store for around 2 hours waiting for a decision, and then Jessops quickly changed their policy!