Need webform with list of items, price, and total
You can try Webform Calculator, I know it has checkbox support. You can set values for fields, then calculate the total amount at the end of webform for the submission. 


  Provides a formula webform component for computed values, where you
  can enter a mathematical calculation based on the other fields. E.g.,
  create a formula field with value formkey1 * 0.1 * formkey2.