Additionly to multiple electric unicycles, I also own a One Wheel XR, a Dualtron II EX scooter, a Meepo V2P and Backfire Ranger X1 electric skateboard.  All three devices offer a very different riding experience than an EUC and all are a lot of fun to ride!  The Dualtron is the most expensive of the three checking in at $2200.  It also is my fastest vehicle, with a top speed of around 40MPH.  The Meepo is an especially inexpensive way to get into the world of personal electric vehicles, costing right around $400