If you own parrots, rabbits, or rodents you have access to many (almost free) garden stock.
For example, I purchased large parrot mix. Inside I got walnuts,pumpkin, pine tree, corn, peanut, peas, hot pepper, sunflower, amaranth, safflower, and wheat seed.
All of these can be planted in your garden next year at a cheap price! Something to consider if your on a budget or just want to grow something for fun.