there are 4 official outlets for freesat currys,comet,john lewis and argos.
i got mine from comet blackburn last monday and they had just got stock in. i had been waiting weeks for argos to get them in and they still dont have stock.
i would give up on argos and try your local comet or currys etc.
you could allways try ebay i was tempted but was too tight to pay over the odds for a box.