Hi, I just bought the 4210 through newegg (yes! so excited!) and was planning on buying the modular battery through superwarehouse.com but they don't seem to have them in stock right now. I was wondering if y'all had any other suggestions as to the best and cheapest place to buy it? Oh, and unrelated second question: is it worth it to buy the fujitsu port replicator over a 3rd party usb docking station? What's the difference?