Checkomatic.com is an online paper and check store that has a mailing-focused division called Business Envelopes. The store offers both printed and blank envelopes at competitive prices. Furthermore, they offer occasional promotions, such as shipping for free when a customer's order exceeds a certain amount.

The website hosts a wide variety of envelopes categorized by size, type, and purpose. Sizes on offer range from #6 3/4 - #14 and include envelopes explicitly designed for checks or invoices and statements. Several practical sizes are also available such as 10 1/2 x 16, 10 x 13, 12 x 15 1/2, 4 x 8, 6 x 10, 6 x 9, 8 1/2 x 12, 9 1/2 X 12 1/2, and 9 x 12.

The range of envelope types consists of bubble mailers, Tyvek, clasp, double window, regular, and self-seal. The self-seal envelopes are convenient, employing either a peel-and-seal or flip-and-stick mechanism. Additionally, they offer more durable and secure plastic envelopes as well. Customers can choose between blank envelopes or use their custom envelope printing service to create personalized envelopes.

The website is user-friendly with a comprehensive search functionality, which helps users to quickly locate the products they require. They also provide a reorder function for returning customers, which simplifies the shopping experience for repeated orders.

Lastly, Business Envelopes has daily specials and reseller discounts schemes promoting an economical shopping experience.

To conclude, Checkomatic's Business Envelopes provides a broad selection of envelope types and sizes tailored towards personal and business mailing needs. It commits to a user-friendly and convenient shopping experience with its search, reorder features, and various discount schemes. The added option of the custom printing service allows for a degree of personalization catering to specific customer demands.