This Portable Guitar Pickup is a simple bolt-on electric pickup which converts any standard acoustic guitar into an electric version. This stuff has been around since the invention of sound of course, but the price makes it interesting. Just $17.00 a set. Unfortunately there’s no way of knowing just how good or bad it sounds from the blurb, so pot luck there.
Portable Pickup for kinds of Guitar! Capture the Mechanical Vibrations and Convert it to an Electrical Signal for the Amplifier!
I had one of these many years ago – the sound quality isn't as bad as you think, but not near as you as you'd like – great for quickly amplifying an old acoustic that isn't made for it.
gets a good delta blues sound