I found an advert in Riteaids "Inner Strength, a guide to living well with diabetes" It's a magazine available free in the store.
The advert says "For 5 free pens, go to http://kwikpenvoucher.humalog.com/form.cfm?k=4
Fill out the form the steps to redeem.....see below
Complete the questions below, read and accept the terms, and click the submit button
Print the voucher and visit your doctor to see which Humalog® KwikPen® is right for you.
If you receive a prescription, take it and your voucher to the pharmacy to get a free five pack of Humalog® KwikPen®, Humalog® Mix 75/25 KwikPen® or Humalog® Mix 50/50 KwikPen®
I'm sure if you already have a standing prescription you could just go the pharmacy.
update: I found an addtional link that might helpful.
Fill out the form for a free sample pack of Click Fine needles.
Join the Strategic Savers group! http://www.tudiabetes.com/stategicsavers