Please go to our Shop page. There is a drop down menu for each Zumio model. You can read and compare features there. When you are ready to purchase your model(s) simply scroll down beneath the picture(s) of the Zumio and click on the 
button.
A shopping cart list will appear on the right hand side of the screen. Details of your purchase will be there. The total(s) price you see are for the Zumio product only. Shipping and taxes are added as you proceed through the checkout process.