How to send many email individually to all contacts

Hi

I'm trying to find a way where I can send my company latest offers and update price list to our all customers which is about 150 Members.

Main problem is they should not find each other emails and email send to all contacts at a time ..

Is there any easy way to send emails like this .. This will save alot of my time to send 150+ contacts

If anyone know then his/her share would be much appreciated..

Thanks & Regards
Mahaj