Hi wick603,
Dropshipping is allowed at eBay, this is referred to as 'product sourcing'. Yes, you can list from anywhere, you just need to declare where the product will be coming from (item location). In your case you need to confirm with the supplier, as for each item you list you will be required to fill this item location info. I don't think you can type in 'from USA or from Canada', you need to be specific which for each item. :) As a seller you should also be able to guarantee that the item will be delivered to the buyer within 30 days of the end of the listing.
Here is eBay's guide on dropshipping -
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Have a read on guides to help you have the edge in your dropshipping business -
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SaleHoo also has a dropship handbook for members, to download please go to Link hidden: Login to view
And if you need help locating suitable dropshippers please feel free to let us know.
All the best! :)