I would only recommend an agent if you need a bunch in a tighter timeline. The agent can go door to door in Ottawa to get your stamps while you would have to mail them back and forth.
A lot of the get in advance ones can be had pretty easily at the border as well or in the neighboring country. We sent away for our first China visa and it took weeks but when we were in Hong Kong our hotel lined up the visa in an hour.
Cambodia used to insist on visas obtained in advance but if you showed up at the border you just filled out the form and paid less than the advance fee.
Russia on the other hand you need to apply in advance as far as I know. If you make a list of the countries you are hoping to visit I am sure the board can help you out with the easiest way to get each visa.
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