Look at the Tracy tables too.
As far as chairs, they are very important. If you want a good chair like what you are seeing there, you should go onto a regular business furniture or office furniture supply store online. Not Office Depot etc.
Im not sure you will beat that price though. I own Han's and Herman Miller's for my office. One of them followed me home one day and took up residency in my sewing room. It's a $500 chair. But I have NO back problems sewing 15-20 hours a week