i recently bought a 26 inch rim mongoose dual suspension MTB. When adjusting everything to my personal preferences i discovered that the provided seat post is incredibly short. I know that bikes with rear suspensions typically have abbreviated posts, because of the swing arm, but this one wont even adjust to the proper height for me to ride it without passing the minimum insertion/maximum height mark. I obviously don't want to ride it like this, so could anyone tell me where I could find a replacement for it? all I can find on the net are carbon fiber ones that are upwards of 100-200 bucks.