LingualBox offers 1-to-1 English classes online starting from $1.5 per session.
There are 2billion English learners in the world, but not all of them are afford to pay $20 for 1 hour class with native speaker.
Our teachers are not native English speakers, but Filipino.
Philippines is the biggest in call center industry in the world and a lot of call centers are catering to customers in the states. This is because in the Philippines, people speak English very fluently and in clear American accent.
The Philippines: The world's budget English teacher - BBC