Most sellers will do so and eBay offers an optional program that will do it for you
But if your items are very varied you may prefer to do this manually, choosing the bulkiest or the most valuable item and piggybacking the shipping for other items on to that.
BTW. The people at eBay don't sell here. That's why they encourage sellers to start auctions at 99 cents in the faint hope that there will be multiple bids and the seller will do well.
Bad advice.
Start the item at the price you will be content with. There are several advantages.
You won't end up selling your item for less than the fees eBay and Paypal charge you. These include fees on shipping costs.
You won't have customers mad that their $0.99 item cost $10.50 to ship. This is often interpreted as scamming. And yes, we know the cost of shipping, but your customer doesn't.
If you can use Free Shipping domestically, you will not be charged fees on any shipping you do. Including to New Zealand.
Free Shipping means 'the cost of shipping is included in the price of the item". So your 99cent monkey now is offered at S11.49 to Canadians. You then use Flat Rate Shipping to the USA, reducing the cost of shipping there by the domestic postage cost you already are collecting.
And.
The low end buyer is the worst customer. Sell the same item for 99 cents and for $99.oo and the complaints will come from the 99 cent customer.
