Many times it is hard to find a small metal object in the ground, but a pinpointer just makes the job a whole lot easier. Don't go by price alone, you want one that is reliable and well made.
Most pinpointers come with a holster to attach to your belt.
Minelab has a new pinpointer - PRO-FIND 25 It sells for about $169. http://www.minelab.com/usa/products/consumer/accessories/pinpointer/pro-find-25