@joy_friday silaMagento comes in 2 flavors - Open source and Commerce. Commerce is further divided in 2 flavors that is on-premise and Cloud commerce.
Open source version of Magento is FREE which you can download anytime and play with it. However in case you do not want to install in that case below are few providers has demo of Magento. You can browse and look into the same.
For Magento commerce (if you are looking forward to paid version), you can send a request to Magento using below link.
Problem solved?Please give 'Kudos' and accept 'Answer as Solution'.