I recently bought a new gas-lift sewing/office chair from IKEA, it was only £49,, came in a variety of colours ( incl pink and turquoise) and has castors that only roll freely when you're sat upon the seat - it's to stop the chair from rolling away from you as you sit so you're less likely to land with a bump on the floor
I also bought one of their height adjustable tables, not the electrically powered one but the 'wind up' version with the larger of the two available tops, and a stack of drawers also on castors that will store under the table or provide extra working surface. The table winds up with a handle to sufficient height for me to us as a cutting out table, winds down as low as you'd ever want and came with a choice of 2 sizes of table top too
So much better than my Horn cabinet which wasn't the right height for me and didn't have enough space for my legs to fit under ( I'm 6' tall with long legs).