Radeon HD 5850 availability wasn't exactly stellar when we checked yesterday, but things have improved a little bit today. Newegg currently has one card in stock for $259.99 before shipping: a Sapphire model with a reference cooler, the same port configuration as the card we reviewed, and a two-year warranty.
We'd also like to point your attention to Acer's Aspire One 751, which is currently available for a cool $299 shipped at BuyDig. That model comes with Windows XP, 1GB of memory, and a six-cell battery, but you can also get a Vista variant with 2GB and a three-cell battery for $299.99 before shipping at Newegg.
As we noted in our review, the 751 delivers an 11.6" 1366x768 display, an underclocked Intel Atom Z520 processor, a 250GB hard drive, and impressive mobility with the six-cell battery—we clocked our sample at over six hours in a web-surfing test. This may not the fastest netbook in the world, but it's definitely not bad for less than 300 bucks.
Last, but not least, Western Digital's 1.5TB Caviar Green hard drive is down to $109.99 with free shipping, or just seven cents a gigabyte. This model does have a reduced spindle speed, though, so it's probably a little too sluggish for use as a main system drive.