Do you think this chair would be too small for a 6 year old?
If you see a floor display upholstered rocking chair of a discontinued style that you like the quality and comfort of, it may be worth your time to ask the store for a discounted price. While some stores won't do this for customers, others will. While a floor display chair may have a bit of dirt on it, it's likely to have not received all that much use since it would only be from shoppers such as yourself trying it out.
A quality upholstered rocker is going to feel sturdy when you stand beside it and place your hand on top of the backrest to try to move the chair. If you hear loud creaking noises, it's likely best to not consider that upholstered rocking chair for purchase. Inspect the bottom of the rocking chair to look for solid construction including a thick wood base. If the wood appears cracked, don't buy this padded rocker model, as it's likely to not be very well made.
You'll find lots of upholstered rocking chairs here for the nursery or the living room. Sure, the old fashioned wood rockers are cheaper but they also aren't that comfortable or need a cushion. Fabric versions are a more modern way to do a rocking chair and there are lots of styles to choose from.