My old gaming chair was similar, old dinning room chair with the back removed/broken off. Office Depot has a wide range of chairs, but I thought I was doing good and investing into a seat that would last at least a decade, at over $200 my chair has lasted about 2 years, and the shredded newspaper filling is starting to come out, and the springs are causing bad pressure in areas that you don't want a spring causing pressure.
At any rate, the manufacturer of my chair is brenton, sadly I cant find the model. My wife got the same manufacturer, but a cheaper model, and it is surprisingly holding up much better than mine, even though it gets more use.