I found mine at Walgreen's. I haven't looked for it anywhere else. But a lot of the members of my clinic's message board had also used OASIS so I assume it must be easily available.
I found mine in Walgreen's on the bottom shelf where all the mouth rinses were. In that store, they were all along the back wall. I will admit there wasn't a huge display of it and I just happened to see it. I would just ask someone who works there.
