Tiger Direct has this Hitachi 500GB External Hard Drive for $39.99. Even better, when you use Google Checkout your price falls to $34.99. Shipping adds $7.55, making this the best price we could find by $7. One way to improve computer performance is to put saved data on an external hard drive rather than your laptop's, so with 500GB of space this can do that or back up your data. Sales tax is only charged in FL, IL, NC, TX, GA, SD and ID.