Search online for a transcription service and there will be hundreds of results produced, if not thousands.
Many will seem to have glowing testimonials and will offer what you’re looking for at a price which can’t be beaten. It’s important however, to look past the showroom window and find out more about the companies you are reading about; there are many which will guarantee speed, the ability to take on bulk jobs, and that say they can offer complete accuracy. If the price and the offering seem too good to be true though, it could well be.