Source for solid styrene rod

[nachoman]

I'm looking for some solid styrene rod about 1/4 to 3/8" diameter. I will use it to turn some steam locomotive domes. I know I can get Plastruct rods at the LHS, but was wondering if there was something that I could pick up at the dollar store (or free) that would work. It doesn't have to be styrene, but I need to be able to glue it to styrene. I thought about a plastic coat hanger, but it seems they are made out of the wrong kind of plastic. Anyone know of a common household item that I could use?