Try cutting some plastic Clothes hangers up?
You can also buy Plastic Rods used for landscaping/gardening, they are usually in the garden section and are green or brown... They are plastics and are cheap, use em to stand up tomato plants etc... If you can't find them or need something longer than a cut up coat hanger, let me know i have some laying in the garage, but they are pretty easy to come by. I have even seen them in the hobby shops for plastic floral displays.