Wax foundation from Hornsby is available here =>
http://hornsby-beekeeping.com/wax/
Considering you are buying a package, can I suggest you buy your frames wax and wired ready-to-go, this will save you a lot of frustration. Not everyone will agree with me (and thats OK). Unless you have done it before, installing wax can be a little tricky. You will find ready to go frames here =>
http://hornsby-beekeeping.com/bee-frames-full-depth-wired-and-waxed/
And for installing your bees with a minimun of fuss
http://forum.honeyflow.com/t/installing-package-bees-without-shaking-or-smoke/1508?source_topic_id=3326