Business Directory Master Data for USA and Canada (411 data)

I am building a 411 or yellowpages type website which will need to be populated with business information....I am looking for someone who has master files of this sort of data which is organized by category. I do not want to "mine" any data as it will be quicker to deal with someone who already has it. If you have up to date data please contact me. I do not have a big budget for this as my site isn't finished yet but I still need it in a timely manner. Please contact me on PM. Thanks!