The most common problem when the shipping calculator is not showing a price is that the dimensions of the shipping service don't meet the minimum requirements but it will not show a shipping price. The calculator won't tell you that when you are listing so it is up to you to make sure that the correct information is there. One way to do that is to look at the Canada Post website ahead of time to see what the requirements are and to check your listings once they are listed to see how the shipping prices are working out.
The Smartwatch listing shows that you ship to Canada and the U.S. only but the US shipping price isn't working. If you are using expedited USA, your dimensions may be too small. The minimum for that service is 21cm x 14cm x .5cm. The minimum for Canada Post expedited is smaller - 10cm x 7cm x.1cm
The Traxxas listing shows worldwide shipping but it looks as if only Canada and the U.S. are showing shipping prices. What service do you have listed for the other countries? I would suggest that for that listing you put in the title As Is For Parts Only. Many people won't bother to read the listing information and will assume that the item works.
For the fishing items that have already ended... It is really overkill to use the most expensive Canada Post service Xpresspost for items that you are starting out at under $10. If they are under 2cm thick, you could use lettermail within Canada and light packet USA to the U.S and light packet international everywhere else. If the package will be thicker than that, you will have to use expedited within Canada but you can use small packet air to the U.S. and everywhere else.
On those listings you are using xpresspost for countries overseas and not all countries have that service which is why your shipping cost is not showing up. The U.S. shipping price is not showing either and that is probably another dimension problem.
Deciding which shipping services to use is probably one of the most complicated parts about selling here but if you post on the seller central board, the sellers there will be able to answer your questions.
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