IF you do NOT want to pay more than double for a visa to enter the United States of America, STEER CLEAR of www.immigration4us.com, which is oddly enough the first result when one googles official site for getting a US visa. This is a deplorable fact, indeed. I had to pay more than 250% for a single US entry visa. They will charge you the same amount, or more, for the fee you must pay for the visa form (free of charge elsewhere), which you will have to fill out by yourself anyway; they will only send it to US immigration. When you think YOUR NIGHTMARE is over, they will bite you again by charging you more than 50% of the MRV fee (in my case) just for getting your appointment date and time, which again via elsewhere will not cost you a penny. I cannot emphasize this enough: RUN FROM THIS SITE: www.immigration4us.com
Hope this will help you in your individual endeavor.