The Twister is an open-source tetrode twister based on Arduino.
It's not currently available for sale, but it's easy to build once you obtain the necessary parts. To get startedAssembled Twisters are available from LabMaker. If you want to build your own, either download or clone the repository on GitHub, then follow the instructions in the Twister assembly manual.
If you've never done any soldering before, and don't have anyone who can teach you the basics, check out the online tutorial at SparkFun (www.sparkfun.com/tutorials/106) . It's really easy once you get the hang of it. This site has a lot of other useful electronics tutorials that offer a great starting point for someone new to electronics.