I have an X-cart license($185), with many add-ons.
I have the following add-ons that I am trying to sell as well.
X-RMA add-on ($45.00)
X-RMA add-on is the tool that automates and simplifies the process of product returns. Requires X-Cart 4.0.0 or later.
Fancy Categories add-on ($25.35)
Affiliates add-on ($35.50)
X-Affiliate allows you to promote your online store. It introduces new type of users - partners in your X-cart system, so you can start affiliate programs to promote your online store. X-Affiliate module automates banners publishing and HTML code generation for affiliates, for the administrator it provides convenient tools for managing affiliates, handle commissions, get statistics on sales promoted by particular affiliates, export and import from CSV files, etc.