Unfortunately, to develop a reliable and flexible customer loyalty extension it takes at least several months of development, followed by many months of perfecting and adding features. Sweet Tooth is a more expensive extension, but the value it brings to your store will far exceed the cost of your license many times over; this just isn’t possible with any other loyalty extensions. Keep us in mind in the future!
PunchTab has developed free magento extension with Rewards/Loyalty Program features. Here is the link for extension http://www.magentocommerce.com/magento-connect/catalog/product/view/id/10600/s/punchtabpoints-2723/
We are looking for beta users and are gladly entertaining feature/enhancement requests to be included in our next release
Please visit http://www.punchtab.com for more details about our instant loyalty platform
tagNpin Social Loyalty Magetno Extension launches the Social Loyalty program across facebook and magento within minutes ( http://www.tagNpin.com ). It also has a free version and ready to fill rewards catalogue option.--> http://bit.ly/QRxrjs