I've finally taken the plunge and started to stretch my own canvas. I should have done this sooner cuz cost-wise, I can stretch my art funds by almost twice as much. Also, it's incredibly empowering to take apart old canvases that you want to reuse instead of having to paint over them. It's kind of exciting actually! I get excited about funny things, don't I? :)
Fyi: staple guns are fun!