Check this site out:
Nanasawa Sensei and if you like it email him and ask for more information. His lessons are very well made, gives you plenty of exercises and corrects them (actually if you do too many errors he won't go to the next lesson till you show you understood the previous one) and it is all for a more than fair price.
Of course being everything done through email I hope it is clear that you will need to work on your own and not rely solely on these lessons (but that is true also for a school).