Most professional services are really high because they usually deal with corporations that figure something is only good if it costs a bunch. If it was just expensive that would be one thing but also I just have found them difficult to work with because translating 20 word text ads is not what they usually do and they don't like adapting.
I'd suggest just looking on craigslist to find someone that's fluent in the language you need and English, is college educated and out of work.