Where/What Mountain Bike to get?

I have one I bought brand new and only put 5 miles on it…I’d let it go for $300…It’s a TREK 4500…not a scratch on it

ROCK shocks on the front…hard tail…it’s not a full suspension bike

http://i29.photobucket.com/albums/c292/spencespeed/ab4cf9ff.jpg

http://i29.photobucket.com/albums/c292/spencespeed/73d52a5d.jpg