They usually vary from 90-110 (approximately), so 106 isn't too good. Still, if you can sell them for over 500 bells each, the price you're buying them for shouldn't matter too much.
Anything under 100 bells is good, because she sells from a range of 90 - 110 bells.
106 bells is quite high, but if your willing to sell them for money, then just go for it.