The UK price for the Nexus S just became a whole lot (nearly 22 percent) more attractive, thanks to the Carphone Warehouse slashing the SIM-free purchase option to a sweet £429.99 ($668). Contract-saddled pricing has also taken a tumble, as the Nexus S can now be had for free on two-year agreements costing £30 ($47) per month. Good news all around, then, but be aware that the handset is now listed as being on back order, having been "in stock" earlier in the week. Speaking of delays, we're also hearing Best Buy's guarantee
