A simple tool, created in a French project "CoMeRe", for exporting data from all Wikimedia fundation projects, include Wikipedia.
To use this, you need prepare two things:
Target dump of Wiki
Target page name
Then, configure the tool with dump path and input the page name, finally just let's it run, you will get the target page. Duration is dependent on size of the dump, and the number of pages.
Take care for using option "talk, other talk...", this is now only for french corpora.