It's so sad, but, a lot of doctor's offices do not give out samples anymore. It certainly saved us all a lot of money to "try before we buy" something if it worked. That was "back in the day!" BTW, Systane Complete puts out a PF (Preservative Free) Formula that works great. I battle dry eyes and they got drier after cataract surgery. I have been on Restasis for years along with Systane and after cataract surgery, it wasn't working as well. I got the punctum plugs (SP?) inserted and the Collagen ones have worked great. The silicone plugs came out after about 2 months and were not as comfortable. I am still on Restasis twice a day and Systane Complete twice a day (better than 5-6 times a day!) and my eyes are comfortable. Praying and God Bless.