[Amazon Canada] Amazon.ca - Micro/Nano SIM Cutter + Free Shipping $6.50
I travel alot for work and sometimes it's hard to find a nano sim for my unlocked iPhone 5. This way I can carry this with me and purchase a regular sim and not have to worry about cutting/hacking one up and possibly ruining it if I can't find a nano.
If you only need to cut 1 SIM then this probably isn't useful for you, your better off trying to cut it with the ruler and knife if you want to save money.
$6.50 includes free shipping.