Donation Ware allows you to add donation/subscription to allows users to select how much they would like to donate and the number of monthly donations they would like to make.  The module has several configuration parameters.

EZ Store is a simple Joomla! ecommerce component that uses PayPal "buy now" button codes - and possibly the "buy now" button codes of other payment processors if you're not a PayPal fan. It is a continuation of Just Joomla's original work on the Mambo TemplateShop/CatalogShop components. Unlike the original components, EZ Store is built using the PonyGallery hack of AkoGallery - so EZ Store has many of the PonyGallery features modified for ecommerce application.

The EZ Donate module allows you to easily show a PayPal donation button on your web site. It has a number of configurable parameters which can be set via the module manager.

This component expands your ability to manage subscription based web sites. Fully integrated with PayPal, allows Admin to create payment plans and an alternative payment option. 

osCommerce Bridge hooks Joomla to osCommerce 2. 2ms2 where osC can run in a wrapper and share a unified login with Joomla. osCommerce Bridge uses the osC registration process and hooks to the Joomla users files to support the accoutn creation. Once an account is created the user logs in through the standard Joomla login (mod_login) and is authenticated for the osC store. 

The TemplateShop is a simple e-commerce solution for those who don't need big e-commerce components. It supports categories, search, and uses "buy now" button codes - so it should be compatible with most payment processors.

mosIPN is designed to allow your customers to purchase digital goods for immediate online delivery. This allows you to fulfill orders even when you are sleeping! - From the developer's website.

mosLock Professional is a solution that will allow you to charge your visitors using PayPal to gain access to restricted content on your Mambo sites. mosLock Professional has many more new features including a guided setup wizard, configuration screens and the ability to choose what group your new users are created in and a Dynamic PayPal Button creator. mosLock Professional admin console as been completly rewriten to be easy to use and to allow you full control over all the settings in mosLockPro. - From the developer's website.

MamboPAL provides the ability for Mambo Webmasters to accept payments via PayPal Buy Now or Subscription buttons and then automatically update there user profile and move them to the registered group. - From the developer's website

mosCommerce is a port of osCommerce to Mambo 4.5.2 (osCommerce for Mambo) The goal of this project is to finally create a descent port of the popular osCommerce for Mambo. MamboForge | Developer website