I figured out the answer to my computer problem

I can either:

Know each question to ask in order to complete an order, and note the answers down.
Have the required customs forms printed out in advance, and then complete by hand.
Process the shipping information at Purolator or Canada Post.
This way, I won't need to change my computer right now.

Or, I can buy an inexpensive computer and a printer. Perhaps a used laptop, and a entry-level laser printer (they are on sale now).