Change Option price based on Product selection.

I am populating my product options based on the script used on this page: http://www.gravityhelp.com/forums/topic/dynamically-populating-gravity-forms-using-checkbox-fields

The code works great, but I would like to change the values of the options based on the Product dropdown selection.

Example:
Client checks multiple options on Form A
Form B received information and dynamically populates OPTIONS checkboxes.

/* So far so good */

There are 3 products in a dropdown (values $10, $20, $30). Based on the user selection of the product...

...the value of the populated options will update.

Any help is appreciated.

Here is the code: http://pastebin.com/mCdstJfg
The site link is this one (it has the dynamic information on the link): http://www.eregisteratrademark.com/payment/?cName=&cLast=&selected_options=001+-+Chemicals,%20010+-+Medical+Apparatus,%20016+-+Paper+Goods+%26amp%3B+Printed+Matter

I want to change the category price ($305) to the correct price based on the product they select from the dropdown. (e.g. Basic = 305 per item, Premium = 499 per item & Extended = 699.)