Zehrs and other Loblaws banns stores have had a string of one day deals lately, and today only, December the 19th, there is an amazing deal on Black Diamond Cheese Strings. Today only, pick up Black Diamond Cheese Strings in the package of 8, which is 168g, for just $1. On top of that there is a limit of 12 so they are probably very well stocked and this gives you a good chance of getting in on this deal.
Additionally, if you have any coupons left for $1 off from earlier in the year, you can get these for completely free. Coupons were available through both Save.ca and also a Black Diamond contest portal. Neither are currently available but the coupons had an expiry date of December the 31st, so this fantastic sale has come at the perfect time to use those up if you do have them.