https://www.nationalnanpa.com/pdf/PL_461.pdf415 has been overlaid with 628 about 5 years ago.
I don't know if RIngCentral can find you a number but one of my clients got a number he wanted from a company called Ring-Ring. I know that he had to pay for that number as it was not affiliated with any particular provider. I'm not at liberty to discuss what his number was or how much he paid for it.
I had never heard of Ring-Ring before he found them, nor do I do business with them. But...he got a number he liked and had it ported to the service he was using. Here's their website:
http://www.ringringllc.comBy the way, I noticed that they advertise vanity toll-free numbers. My client got just a regular, not a toll-free number.