Hi Sam
China is indeed the cheapest but that will depend on volume in relation to shipping costs, I wouldn't consider going to China for general stationary though as volumes wouldn't be large enough. India is also cheap.
Rule of thumb around 50-60% cheaper depending on the product, sometimes more.
Central & Eastern Europe around 30-40% cheaper.
Western mainland Europe 10-20%.
This is so variable depending on what products you need printing, volumes, where it need's to be distributed, currency fluctuation etc.
New and emerging EU member states have seen costs rising so there are many variables to take into account.
Hope this helps.
Gary