I work for a prominent Eye Care Institute. We have patients who come from all around the world to see our doctors. Here is the list of tears, ointments and gels that we use and recommend. these cost a bit more than Visine and generics but are much safer and gentler on your eyes. The ones marked Individual vials are one use vials and will be the most expensive (usually). All of these can be found at drug stores like CVS and Walgreens, pharmacies including in my area Walmart and Kroger. Costco and Sam's Club also carry some of these. I have found the best prices to be on Amazon.