What is the best website to get a tax id number so I can buy wholesale?

What is the best website to go to so I can get a tax id # so I can buy furniture and other things wholesale so I can resale them and make a profile? How much does it usually cost? How long does it take to get one. Do I have to have a business to get a tax id # or can I just use it to buy things to sell on the internet? thanks for reading