Jacqui, Some of your shipping prices to the U.S. seem a bit high. For example, you have $13 shipping for the halter top to the U.S. via surface. Actually U.S. surface will not be available much longer...another day or two?? (international surface will still be available although I would recommend using international small packet air for most overseas items.)
Your halter top may be able to shipped at under 250 grams and if so, you could send it small packet air U.S. for $7.80 postage (or $10.10 if between 251-500gr).. You can add fees to the shipping cost for shipping materials or you might want to add those costs to the item price so that shipping doesn't seem quite so high.
For packages that are under 2cm deep, you can use light packet to the U.S. It might take some creative packaging but you could probably send the kids tshirt and perhaps the scarf as light packet. You could use a white poly bag with a light piece of cardboard or some sort of stiffener to keep it from bunching up....a file folder might work. Cost for light packet USA under 250 grams is $2.65 plus tax. Within Canada, you can use lettermail to ship items under 2cm deep. There is no tracking or insurance with light packet or lettermail.
Light packet and other shipping prices can be found here. http://www.canadapost.ca/tools/pg/prices/CPprices-e.pdf See pg 24 for light packet US.
There's tons to learn about shipping but I'll mention one more thing. You might want to use calculated shipping within Canada so that you are charging less to buyers in western Canada and more for Ontario and east. If you use paypal to print your expedited parcel labels, you will receive an approximate 20% off of regular parcel counter prices. There is a way to account for that discount or part of that discount in your listing. There is info about that in post 5 in the following thread.
http://community.ebay.ca/topic/Seller-Central/Paypal-Shipping-Cost/3000008180?#msg3000052904
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