I've bought heat sinks for these chips here. The price was $10 with $3 shipping.
It was a very tight fit and when I tried to get it to fit with a different Ethernet cable the hole was too small. So, I decided against munging my Wang Chung cassette.
It looked like the Doors double-album was large enough.
She said they didn't have any double CD cases at Goodwill, but they did have a small wooden box. The best thing was the color of the box.
Now, this isn't finished. For one thing the hole for the USB is too small and it's too late to Dremel tonight. Moreover, I am worried about air circulation being insufficient to accommodate heat dissipation. At the moment my Raspberry Pi Model B 512MB does not have the heat sinks I put on my Model A 256MB. I've ordered a 2nd set of heat sinks and we'll see how they do.
The system says I'm starting at 111 degrees when the Raspberry Pi is sitting out in the open. We'll see.