Http://www.woodburyproducts.com/snugpromo.htm
http://www.dmponline.com/catalog/category.asp?id=38
http://www.dynamic-living.com/overnight-disposable-underwear.htm
http://www.lynncore.com/free-samples.htm
http://www.theincontinencestore.com/site/999468/page/787249
http://www.cwimedical.com/samples.html
http://www.serenity.com/consumers/products/order
https://personallydelivered.com/product_info.php?products_id=165&osCsid=09ff7109cc4d4aa360ade34cc64fc708
http://save.lovetoknow.com/Free_Adult_Diaper_Samples.
Get free Pampers diaper samples and coupons by signing up for the pampers.com mailing list. You get some extra junk mail but given the cost of diapers, its worth it.
Hope this helps. If you order any of these samples, let me know what you thought of them.