Charge is by cubic volume, not weight and set by the freight carriers e.g. UPS. Same with Freestyle as with B&H. Savings on film purchase is best accomplished by doing it as part of a group; this has been done before here on APUG. That way freight cost, which will be substantial, is spread move evenly over the numbers. There is agreement among APUG members that film is generally the least brutal financially to get in.
The conspiracy is here with Australian retailers, not the overseas ones. I do not buy film here now, preferring to join an APUG group planning such a purpose. Chemicals and fragile stuff (glass for example) cost a fortune for freight, so keep it to just film.