Om Yakshyaya Kuberaya Vaishravanaaya Dhanadhanyadi Padayeh
Dhana-Dhanya Samreeddhing Me Dehi Tapaya Swaha
Sri Lakshmi Kubera Mantra

Om Sreem Hreem Cleem Maha Ashta Iswarya Sampathu Aadhi Dhiyudha
Maha Kubera Managala Sarva Bhagya Sudharsana Sanka
ChakraPadma Ghadhayudha
Sree Lakshmi Narayana Dhevaya Namaha

Moola Mantra 

Om Shreem Hreem Im Kubera Lakshmiai
Kamaladharinyai Dhana Akrashinyai Swaaha

Kubera Gayathri

Om Yaksha Rajaya Vidhmaya
Alikadeesaya Deemahe
Tanna Kubera Prechodayath.

It is believed that chanting this mantras 108 times daily attracts Wealth and prosperity. One may also place a Sri Lakshmi Kubera Yantra in the Puja room for better results.