I have just seen these really great stretcher bars for artists to be able to use to make their own canvases. They seem like a really good idea. It means that you can buy something which will be exactly the right size for the particular picture that you want to paint. Some artists like to paint the same size all of the time and others like to do different sizes depending on their subject matter.
Paired up with some good quality stretched canvas it is easy to get a great effect and you get much more satisfaction from your artwork, knowing that you have prepared the canvas yourself and also done the painting too. It also means that you can make sure that all of your paintings are the right size to fit in your portfolio cases which is really useful too. It is worth a try as it can be really satisfying work and great fun as well. You should be able to find all the supplies that you need really easily and at a good price so you can start quickly. If you shop around you should be able to get great value for money so it is well worth a look.