One of the primary reasons I have not tried weaving is the expense of a loom. Well, Saturday my granddaughter and I visited the Salomon Farm Fiber Arts Festival where I saw a loom made from cardboard. Ruh-roh. I could barely wait to get home to try this.
I know - not a pretty sight. In my defense, I was babysitting an increasingly restless pre-schooler at the time. It is an inexpensive way to get a taste of weaving, though.
I referenced this site for detailed instructions (which I failed to follow very well), in case you are tempted to try this at home.