I'm in the US. I found this on Amazon
https://www.amazon.com/Comfort-Zone-Anti-fungal-Solution-Ounce/dp/B07FCXVHB7/ref=sr_1_5?crid=3BFW1R7T5UGBN&keywords=undecylenic+acid+nail&qid=1650198921&rdc=1&s=hpc&sprefix=undecylenic+acid+nail%2Chpc%2C156&sr=1-5