lactobacillus reuteri? I can't find the specific one you're saying but I found one on amazon that was the one single strain of lactobacillus reuteri for $50. No it looks like you were correct at least that it exists.
I guess they mean 'GUM PerioBalance'? but everything i find about it seems to be press releases of the company who patented the strain (sunstar), even the wiki page reads like an ad...