Matt Royal

Easily choose between redirecting users or displaying notifications with the option to disable e-commerce functionality whilst still allowing product visibility. You can set your notifications to occur site wide or only on WooCommerce pages, thus not affecting any other part of your website.
Logged in admins will not be redirected or see the notifications set in the backend, so you can continue working, testing and managing your store seemllessly without your users ever being aware you are working on it and without it interfearing with your work flow.
For Premium Users:
You can set an end date that will automatically disable redirects or notications to resume your store to its normal view, just in case you forget. You can also enjoy the flexibility of being able to adjust the frequency at which to display your store notifications or redirects to your users.
You will also be able to create your custom messages with a WYSIWYG editor(just like on a page or post), making use of lightbox popup modals and be able to use any shortcodes including some bundled with the premium version for your convenience.
Requires WordPress 3.0 + and WooCommerce 2.0 +.
Get in touch with me at: 
http://mattroyal.co.za/
Features
<ul>
<li>Redirect users</li>
<li>Show notifications/messages</li>
<li>Control colour scheme of notification area to match you theme/website</li>
<li>Set for all pages or only WooCommerce pages</li>
<li>
Disable e-commerce functionality but still display products
</li>
<li>
Use shortcodes anywhere you display messaging – Premium only
</li>
<li>Lightbox Popup option – Premium only</li>
<li>Auto disable with end date – Premium only</li>
<li>Control frequency of messages – Premium only</li>
<li>Countdown Timer with various display options (& other handy bundled shortcodes) – Premium only</li>
</ul>
<h3>Usage</h3>
<ul>
<li>Go to ‘WooCommerce’ > Maintenance Mode</li>
<li>Specify your mode (redirect or notification type)</li>
<li>Specify the display (all pages or WooCommerce pages only)</li>
<li>Once these settings have been saved, the appropriate tab will then be added to the screen to further manage your options</li>
<li>Add a URL for redirect or add your message content, set your colour scheme and save.</li>
<li>Preview your settings and once your satisfied, make sure your activation is switched on (under general settings).</li>
</ul>

WooCommerce Maintenance Mode (Free)

Unique in that it disables only e-commerce activities rather than taking an entire site offline. One of many basic features you'd think would get built directly into WooCommerce. 

Anyway, the plugin does work, but it can be a little fickle to test. Incognito mode and on a staging server is more reliable than the built-in preview modes on a live and well-cached server.

It good enough I'm going to spring for the very inexpensive pro version and gain popup support.

Hooray at last! This plugin fills a hole in WooCommerce long needing filling.

Store messages or redirects on all WooCommerce pages for non admins. Other pages/posts unaffected. Ideal for store maintenance or store wide notices.

netfett

The maintenance mode only puts the WooCommerce Shop into maintenance mode, but not your entire website. Decide for yourself which text or content should be displayed.
Possible reason for the “Coming soon” mode: 
Your shop is not quite finished yet, but you want to show your visitors that a shop is about to open on your website.
Possible reason for the “maintenance mode”: 
You made an error while configuring or maintaining your products, and you can’t find the error right away. Then switch your shop to “maintenance mode” and take your time to correct the error.
And the best thing is: it’s free! 
Yes, it’s absolutely free. There is no premium version.

Maintenance mode for WooCommerce

Does what it says and is easy

Maintenance mode for the Woocommerce Shop

WooCommerce Maintenance Mode (Free) vs Maintenance mode for WooCommerce