Number of Canadian sites have Purge mods on sale, but selection is quite low. Gas City and Saddlehorseblues are a couple that come to mind. Ecigarettes.ca does sell used products, and authentic Purge mods are sometimes popular. All depends on what he is able to get his hands on.
A Google search brought back Sky Vapes (US) – large Purge selection with many on sale. Never used the store so no comment.