Reduce queries whenever _products are rendered.

Before the change:
![without_change](https://cloud.githubusercontent.com/assets/1831235/4236032/56b2aa72-39c4-11e4-9eba-e302f554576b.png)

After the change:

![with_change](https://cloud.githubusercontent.com/assets/1831235/4236037/5eab9ef0-39c4-11e4-9808-b5ca6aabb63e.png)