I would go and get a quality fluid head tripod before getting a Gimbal. Amazon has a refurb. Manfrotto pair of sticks and head for 118$ (https://www.amazon.com/Manfrotto-MK290XTA3-2WUS-Fluid-Video-Black/dp/B013JS86SW/ref=sr_1_36?s=electronics&ie=UTF8&qid=1518150213&sr=1-36&keywords=fluid+head), which is a great refurb deal.

If you seriously need a gimbal, you can also get a cheap steadicam which can give you smooth results. It's a pain to set up in a pinch, but it will get you smooth shots. Also, do you not need a microphone?