I no longer sell hammer and hardie sets, it's not so much the tools but getting a stock of the hardie blocks has been very difficult. I now have to buy in a minimum amount which means getting them to the workshop is a problem and they take up too much space. If you just need one then I would say find a company near to you that makes timber frame buildings. They usually have off cuts that you can get relatively cheaply. The blocks I use are 9" tall and 7 - 9" width. These work fine as you can use them both on the floor and, if you're sitting, on a stool or small table.
For the tools I do recommend the company below, reliable and easy to order from the deliveries arrive in the UK, usually within 5 - 6 working days. They are based in Rome, Italy.