Here's an easy way to make an electric drum set for about 150 dollars that sounds and works great. I am going to post instructions, but this should tell you enough.
Get two rock band drum sets. Open the drums. They are easy to open. Just put your hand in the little gap about halfway through the drums and carefully lift up. In the center, there would be a circular area. Keep those clean.
Buy nine of those tiny recorders that you press a button to play. They are about 4 dollars each.
Record a tom 1 sound, a tom 2 sound, a tom 3 sound, a bass sound, a snare sound, a crash cymbal 1 sound, a crash cymbal 2 sound, a boom cymbal sound, and a hi-hat cymbal sound.
Glue each drum sound inside the center of each drum. Glue the bass one underneath the bass pedal. Turn all the volumes on high.
IT WORKS! All for pretty cheap.