Leave them in their pots if you're broke. Take a butcher knife and push down through your roots at the angle and deep enough you hear/feel them cut. Don't go nuts. 4 or 5 should start you and make them about 2 inches away from the edge of your container. In a few days do it again and keep doing it every few days and place some closer to the plant. Do not touch the tap root.
The new smart, or air, or fabric bags (all the same principle) do exactly that but by severing root tips that protrude through the first fabric layer. The second layer is opposing weave and the sawing action does this task.
Cutting roots does the same as topping - multiplies the tips but by 2 or 4 instead of just 2 like your plant above ground.