The bonus sim means you're getting 2 for $5 each. Not $10 each. Keep the other one for referrals or future problems or lost phone/sim.
You can also buy from Canadian Cell Supplies.
Buying the sim does not get you service. You need to go through the activation process when you get the sim.
You can also use the find a store link below to find a corporate store that sells sims in your area. Call ahead.