Mod Kits are available on many internet dealers such as www.amazon.com and www.ebay.com; but I wouldn't trust eBay with my money. Also, don't you think that a superdrive will be more use to you than a second hard drive. You should get an external hard drive and replace the internal superdrive. But I suppose if I can hold that point, I have to mention that you could buy an external superdrive on www.amazon.com too.