Looking at the DiscountHondaParts site, you'd really need to be ordering a reasonable amount of gear based on the postage charges. If you're paying $100 for the part and then another $54 for postage it may work out as cheap to buy from the local Honda dealer.
I know when I had to get my water pump from the States, because Honda Oz couldn't supply, it cost near as much as the part here because of the postage cost. I've noticed recently that the price I'm paying at the dealer isn't too bad when checked against US sites, usually only within a few dollars based on the current dollar value. Also PayPal doesn't work on the published currency conversion, it's never as good.