I just checked the shipping regulations on the Costco.ca website. It says:
Shipping Information
Currently, costco.ca offers shipping in Canada only. We do not currently deliver to P.O. boxes, international addresses, and to a few limited geographic areas within Canada. We may expand service to more areas in the future. Please check our site regularly for updates, or send us an e-mail and we will notify you of our expansion.
I'm not sure where in New Jersey you're located, but are you in a position to nip across the border and buy the item locally? (Here in Southern Ontario cross-border shopping is kind of a regional sport)
Another option, if you know someone who lives in southern Ontario, is to have the item shipped to them and then arrange for them to mail it to you.
Hope this helps,
Trinity