Google rolled out a new "YouTube Ready" designation for professional caption vendors in the US. The first launch of the program includes 12 qualified vendors, with more to come.
"YouTube Ready logo identifies qualified vendors who can help you caption your YouTube videos."
If you're interested in having your videos captioned, check DCMP's list of YouTube Ready vendors, and mind that participating vendors: "Have passed a caption quality evaluation administered by DCMP; Have a website and a YouTube channel where you can learn more about their services; Have agreed to post rates for range of services they offer for YouTube content. Typical rates range from $2/minute for a transcript to $10/minute for full professional captions."
More Info: DCMP's current list of YouTube Ready vendors