The WD-40 Company is giving out free samples of their Blue Works industrial lubricants.  I got a free can of Dry Lube PTFE Formula; it's a Teflon lube that is completely dry so it doesn't pick up dirt like oil or grease does.  It was a rather large can, 10 ounces, about the size of a standard WD-40 can.  They also have several other varieties of lubricants, cleaners and penetrants that you can try, but you can only request one sample.

Go to http://www.blueworksbrand.com/sample/
Select the product you want to request
Enter the offer code MLB
Enter your name, e-mail, address and phone number
Enter that you heard about the offer from "Machinery Lubrication Magazine"
Fill out the rest of the form and hit Send

Technically this is for "industrial professionals".  One sample request per person, available while supplies last.  Offer only available in the continental US.