You can use paypal to order the book, Paypal will take all your information for us and calculate the shipping costs and add tax for Colorado residents. You select how many books you want at the paypal site by changing the quantity in the quantity box and then clicking the button  marked "Update Totals"):

Click this button if you are ordering less than 10 books.

 

If you are ordering 10 or more books you get the bulk discount, so use this button instead

 

Books are shipped via media mail (book rate) from the postal service and usually arrive within a week's time.