One of my biggest complaints in the past about Amazon's Prime shipping membership was that it was too difficult to filter Amazon's inventory for products that were eligible for free shipping. What good is a free shipping program if you can't figure out which products quality and which are shipping from 3rd parties?
This doesn't only effect Prime members. Anyone who'd rather buy from Amazon directly benefits, including people like myself who are sick of receiving print catalogs from Amazon's 3rd party suppliers after buying something through Amazon. Stop that.
Now, what do we have here from the left margin of Amazon:
A link that filters search results for Amazon.com's own inventory: the product eligible for Amazon Prime. Nice!
A delicately worded link that does exactly what I was looking for.