Every country should have access to welding wire. I bought the thinnest that I could find which is .9mm MIG welding wire. I have to use straws as sleeves to stop the wire from flexing, otherwise it works great and is relatively cheap. They do make thicker than .9mm, so you may find exactly what you're looking for. But MIG welding wire comes in spools and needs to be straightened, or you could just use the thinner stuff and coffee straws for sleeves.
I don't think all hardware stores sell welding supplies, but you should be able to find a store in your area that sells welding supplies and just ask for a spool of MIG wire. Some auto parts stores sell it.