Students can get online one-on-one math tutoring on Tutor.com, Chegg.com and SchoolTrainer.com as of 2015. Their prices vary, but in general, you can expect to pay between $20 and $30 for an hour-long session.
On Tutor.com and Chegg.com, look through a list of tutors, and choose which one to contact. On SchoolTrainer.com, fill out a form, and the tutor gets in contact with you.
It's important to do your research when it comes to picking a math tutor. Math.com recommends not simply going with the lowest bidder and taking time to make sure the math tutor has the training required for the type of math she is tutoring. A tutor should have at least a high school diploma if she is teaching young children math, and if she is tutoring high school or college level math, she should have at least an undergraduate degree with an emphasis on math.
Students looking for extra math help after their sessions with tutors end can find tutorials in the form of articles and videos on those websites as well as on KhanAcademy.org. A good way to make sure the knowledge gleaned in these sessions sticks is to practice, so these tutorials may be very helpful. These kinds of resources can be very helpful if you can't afford a tutor, as well.