I"ve had the same problem. I am temporarily using some old chopsticks formed into a cross.
you could get some dowels from a hardware store, cut to sizes you need and wrap the joins with string or wire... (maybe glue too for permanency?)
I also found these neat decorative wooden stems at IKEA that i'm going to cut up and use as supports for climbers. perhaps you could find something kinda like a lattice... Michaels craft store?
Shot at 2009-10-04
or- if you have any outdoor gardening fence (the green kind) you could cut that up into whatever size you needed and form it. it might need some supports