Indeed, you cannot get a score of the speaking or writing, as they have to be evaluated by someone who understands and follows the ETS evaluation rubrics etc....
One of the teacher's at our school is offering a free speaking assessment, though he is quite busy so it may take a week to get a response (hopefully faster, he just got a lot of response): TOEFL Ryan and click the RECORD HERE! link
Our school offers assessment for a (low) fee, and now is a 2 for 1 special: Assessments
ETS offers a complete test where your essays and speaking are score. But note: THESE ARE SCORED BY SOFTWARE, not a person, please read the details. So whether these match with real TOEFL evaluations, who knows: TOEFL Practice Online
Notefull is another online TOEFL school and they do assessment for a fee also I believe: https://www.notefull.com/
Teacher Corey offers great help in TOEFL, I dont know if he does one-by-one assessments: Welcome to www.toeflprofessor.com, your online ibt toefl teacher
Hope that gets you started!