You can buy some small flint nodules from
http://www.dixiegunworks.com, or go on E-gay, and list flint knapping. They have a number of sources of pounds of flint from several areas that are much cheaper than what you will pay for flint through Dixie Gun Works. I just checked and they showed 34 sources of flint on the page today. If you study the geology of flint, you may find some around you. I am not familiar with Canadian Geology, but I thought that New Brunswick was made mainly of granite. If so, you don't have sedimentary rocks, like limestone, that were re heated and melted and cooled to form flint nodules. You may also look for obsidian- volcanic glass, as this can make an excellent flint-like substitute. And, you may have amber, which makes a very excellent gun flint. These are expensive compared to flints, according to the price list I saw in Dixie's catalogue.