Yes, you can get a piezo buzzer at Radio Shack and turn it into a pickup. They work amazingly well when you consider that it costs all of $3 or so compared to the $100 and up manufactured piezo pickups go for.
Plans for this have been published in the past, not sure if there are any online sources.
Basically you need a buzzer, some shielded cable and a 1/4" jack. The part that I can't explain easily here is where to solder the leads from the cable to the piezo element after you remove it from it's plastic housing. Once you've wired it up, you glue it to your bridge.
I've built a few over the years for friends needing to amplify oddball axes like ukeleles or autoharps.
I might ask why you need to amplify your bass for practicing at home. It is an acoustic instrument, after all
