Delta makes a shower unit with an adjustable spray head attached to a 6' flexible hose for around $45 at the big box stores. They have several styles and colors to choose from, and they hold up reasonably well. All plastic construction, which keeps the price down, this unit attaches to a standard shower arm with only a pair of slip-joint pliers needed to install.
If you need the shower head to be in a fixed or adjustable position lower in the shower, a slide bar unit is also available from Delta starting around $115 at Home Depot. This must be mounted to the wall with screws, so if you have a fiberglass enclosure you may want to look for a unit that attaches using double sided tape so you don't put holes in the enclosure.