Try an office supply store for art supplies. I used to work in a place that mostly did staplers and photocopying, but they also had canvases and acrylics for whatever reason. Also if you're just learning, I wouldn't waste money on canvases yet anyway. Go to a hardware store and buy squares of a smooth board and paint on those, great for learning

If that doesn't work, try ebay I suppose, you can get some stuff so cheap on there. I use golden acrylics, great brand but on the slightly more expensive end so probably not for starting.
Good luck and be sure to share
