Scott (@scottsweb)

Add Google style instant search and search suggest to your WordPress powered site. This plugin will begin displaying search results as soon as your site visitor starts typing into the search box.
The plugin requires very little configuration and should work out of the box with most themes. The plugin has its own options page to configure the plugin to work with your theme if you require it.
<a href="http://scott.ee/" title="WordPress designer and developer" rel="nofollow ugc">a plugin by Scott Evans</a>

Instant Search & Suggest

Instant WordPress search with search suggestions for tags, categories and titles.

jamiechong

If you are running a promotion that highlights specific products, you may want to provide a link that automatically adds these products to the customer’s shopping cart.
This plugin allows you to do exactly that. Example:
Following the link <code>your-domain.com/promo/summer-sale</code> would take the customer to <code>your-domain.com/cart</code> with 1 or more products auto loaded.
Settings to create your unique URLs can be found at 
 WooCommerce > Settings > Checkout (tab) > Autoload Cart (bottom of the page)
You can also automatically apply a coupon to instantly give a discount.
This a perfect plugin to use when linking to a promotion from Facebook, Twitter or an email newsletter.
Have an idea to improve this plugin? 
Please tell me about it in the Support Forum.
Found a bug, or it doesn’t work for you? 
Please report it before giving a negative review!

WooCommerce Autoload Cart

Generate unique URLs that autoload products and/or coupons to the cart.

Instant Search & Suggest vs WooCommerce Autoload Cart