My daughter Mylie wanted a 29er bike which I had no idea what that was. So I went to Amazon but those bikes were either too much or seemed junky. The trek store wants almost $1,000 for one.
Long story short a google search found Bikesdirect and I got a 29er with hydraulic disc brakes like my husband motorcycle
Way under half the price of the bike shop and several hundred less than any similar Amazon mountain bikes
Very happy