Option to take shop off-line.

Is there an option to take the shop off-line - like Kunena has an option to take the forum off-line.

Need option to be able to keep the site up, but just take the shop down for maintenance.

Could hide menus, but that would be confusing and other links would still work.

There is no option but that's a good idea.
For now, you can edit the file components/com_hikashop/hikashop.php and add at the beginning:

$app=& JFactory::getApplication();
$app->enqueueMessage('The shop is in maintenance');
return;

That way, the front end should be disabled while the rest of the website should still be working.

Thanks, any idea which release it might be in?

We'll add that to next release.