Good grief! Don't pay anybody to do the paperwork for you. There are instructions on the web:http://www.arrl.org/applying-for-a-vanity-call
The price is always changing, but it's presently $15 for the 10-year term of your license grant paid at the time of application and renewal. Be sure to pick a valid and available callsign, though. If you want a good laugh, take a look at the rejected applications sometime.