I am thinking about taking piano lessons and I found a music school in my area. They charge $30 for a half hour private lesson and are flexible in the event I would need to reschedule, which is a plus. I'm not musically savvy….does that seem reasonable and fair?
I guess it all depends on how much you are willing to pay.
If you are willing to pay that, great 
The flexibility is a MAJOR bonus, I learn classical guitar at about R150 an hour and teach it at R100 an hour.
R150 is the same as $20
Thats just an Idea though.
I think that if you are going to practice piano then you should invest in the school…