Wow, that is really a lot of money. She is making $120+ per hour? That seems crazy. I guess you have to decide if you can afford it.
If not, I might just put an ad in a community paper, a college classified ad or just ask around. Our “teacher” was found by accident: a repairman said his girlfriend was from Beijing, when he saw my Chinese son. She isn’t a “teacher” but is more than adequate. I do something like give my child a bath, or we play with his train etc, or I cook, and she gives me phrases and sentences, and I write them down. She adds in characters. It is very informal, but very pertinent.
We sometimes listen to chinese music on cd, or dvd. Sometimes she helps me to read a chinese picture book. She is a great resource: she brought us homemade dumplings and gave me the recipe. She brought us chinese new year ornament and told us what all the traditional things to do for new years is: cut hair, new clothes, clean the house, food, red envelopes with $ for the kids, etc. Just think how much you can get just from a regular person who has lived the culture and language.
She also taught my son to count perfectly in Chinese in 15 minutes: she put his stuffed toy turtle on her head, and counted "yi! er! san!.. and he had to repeat after her each number before she said the next one… and then at shi! (10), she jerked her head forward so the turtle fell off and he caught it, and laughingly screaming wanted it again and again. I heard him counting perfectly with tones to 10 that night in his bed (he is 3).
Just to say, you don’t need a real teacher, or planned lessons, or organised class, or materials other than a pencil and paper and your everyday life. Plan to bake cookies one week, play with playdough the next week, and you could probably find someone, even a student (like the one who plays with my son in chinese for free), who could say what you are doing, what the dough colors are, etc, all in chinese. Believe me, the kids, and you, will remember so much in context, and not cost $120 each time!!
Good luck!