Having a steamer is a definite must have if you are reselling.
I personally use a stand up steamer. The type you use depends on cost and how much you will be using your steamer.
I have used a small hand held smaller steamer in the past, Yes, it was way cheaper. I quickly found that this steamer was Not my thing. Fighting with the short cord got old real quick. The constant refilling of the tiny water reservoir drove me nuts. And so, it got listed and sold.
I love my steamer now and use it quite often. I use the Conair upright extreme steam steamer. The water tank lasts forever and is easy to fill. It alsonhas wheels and a long cord, yay! I usually hang my hangers on the rack and go to town.
There are way too many steamers out there at various price ranges. Do some research and choose the best to suit your needs and budget. Below is the link to the steamer I use.