This is a very simple easy to make AM transmitter if you don't want to use inductors or capacitors and don't mind not having extreme power. The best part is everythinf you need to build it is at Radio Shack.
Step 1: Building the circuit
Once you have all the parts the circuit is very simple to construct (on a breadboard anyway). The simple seven component schematic is below.
A decoupling capacitor is needed for battery operation =]