Mob spawners are easy to get, just go mining and you will find The best places to find are: Ravines and abandoned mineshafts Pd:/ i think no-one will show you something like that since you could grief and they will be because of loosing their xp grinder/mob trap
Ive seen your in utopia But for me I went with crazy and spiders spawned out side of that little box D: Long Story Short. I died and have never been back