I pay $100-120 per ounce for mids ($12.50 - $15 per eighth), or $25-30 for an eighth of the same weed if I buy by the eighth. Dank ranges a lot in price, from around $40 an eighth for low dank when you get a good deal, and up to $70 an eighth for high-end dank. Never paid more than $70 for an 8th and hopefully never will.
So...anywhere for around $3.50 a gram for mids by the O, and up to $20 a gram for good dank by the gram or eighth.