You could try http://www.idictate.com

They offer a 100 word free trial:

http://www.idictate.com/tryfree.shtml

You can submit your recordings over the phone, or convert them to .wav files and then submit them through their website:

http://www.idictate.com/faq.shtml

Here are some other possibilities:

http://www.automatedtyping.com/index.htm

http://www.fantastictranscripts.com/index.htm

Bill