KOB-TV reports that Roswell police arrested Anamicka Dave after officers posing as sellers arranged to meet her through text messages.
According to the station, Dave's ad said she was new to town and "looking for Mary Jane."
Roswell Police Sgt. Ty Sharpe says he was surprised someone would post an online ad for marijuana and he thought it might be another police sting.
Police met the 29-year-old Albuquerque woman in a parking lot and then arrested her.
It was unclear if she had an attorney.