Polyester resin doesn't require a pressure pot, and can be found at craft supply stores in small quantities. If you find you like it, it can be ordered in larger quantities from other suppliers. I've made several blanks this way with good luck. I cast in 3/4 inch pvc tubes.
Polyester resin works especially well if you warm the container in a bucket of water. It thins it and allows the bubbles to rise. It can dramatically decrease the amount of time it takes for it to set though, so be careful. I got more air bubbles using vacuum than I did by warming it and so did a friend, so if you don't have a pot give it a try.