Full purchase details are always available on the web at :
There are links for standard copies as well as upgrades. Purchasing is done via FastSpring who handle payments and processing for us. They offer credit card, paypal and purchase order options.
We do have discounted pricing for competitive upgrades, and for Education or Not For Profit customers. Contact us using the form on the website for more details.
Tax is handled and calculated by FastSpring as the vendor, so only CA, USA related taxes are applied.