Hi Riccardo, not sure about Ireland based suppliers nor SF approved but you might want to check http://www.kettlebells.co.uk/ - they appear to have a decent range from cheap to fairly decent ones (I was thinking about the USA Metrixx range they have).
James (SF team leader) from Kettlebell Fever still carries some old DD stock so will be another option.
I have used wolverson fitness for a 16kg kettlebell and while the handle could have done with a bit more finish, the design and the overall quality is very good.