Adding a pricing to a WordPress site is not that complicated. If you are planning to use a pricing table to promote business products, you need to make sure it looks professional. WRC Pricing Tables for WordPress can help with that. It is a responsive CSS3 pricing table that supports unlimited columns and rows. It lets you compare and promote your products in an attractive fashion.
The script lets you modify your tables and packages easily. You can change background colors, add rows/columns, sort columns, and more. Want to modify ribbons and link buttons? No problem. WRC Pricing Tables also supports CSS3 tooltips.
You can try this plugin for free, but the premium version offers more features, including custom templates and ribbons.