A builders merchant will be found in any sizeable town. The average builders merchant will be able to supply nearly anything that is currently available but not necessarily out of his stock. Generally, a restricted range of proprietary products is available over the counter, and standard builders and plumbers materials are of course always to be got. However, special proprietary items are a very different matter. Imported goods may be difficult to get through your local merchant but, more important, unusual items are often on extended delivery.