Maybe some tax advice on price. Amazon and Newegg normally don't have tax, but other might. Just put some symbol after those seller that charges tax will be very helpful.
Since tax can vary by retailer to retailer, state to state, even street by street within a zip code, we don't automatically set tax rates. However, you can configure them in your user preferences to set what your tax rates are for various retailers. Once you do, it'll automatically be included in your price calculations.