Jim,
Interesting topic, so I dug into it a little more yesterday when talking to our factory. Many of the same points were reiterated to me.
1. As Andy pointed out, only a certain percentage of the material is "petroleum based". One piece of info new to me is that most of our components come from natural gas, which has not seen such a dramatic drop as crude.
2. The plastic industry is not as agile as the gasoline business. As Tom stated, the cost of raw goods right now is reflecting previous purchases. Also was told, "even if they see some decreases, they just cant go out and change the price at the pump." So, most of their costing decisions are made on where they think the price is going
With that said, they are starting to see a "softening" in pricing. I have not seen any price reduction and like others, will not hold my breath.