The chrome versions are relatively hard to find, but you can find vintage bentwood Thornet pieces like the one below on eBay and Craigslist. Replicas are very affordable, but the originals will run you upwards of $1500 for a vintage piece. (I think my parents had one of these for me when I was little, wish I could find a photo!)
Comfy upholstered rockers are another nice option as seen in the room below designed by Sherry Hart.
Here are a few favorite rockers of mine in an array of styles: