Where to buy large rugs?

I'm looking for a 3.5m x 3.5m rug or thick pile carpet to add to my listening space.  I've looked at Persians and Chobe's and none are the right size (and mostly the wrong colour too).  I'd prefer a rug if possible otherwise I'll order some carpet as a last resort.  Question is, where does one find rugs that don't have ying yang and that kind of modern "fart" design imprinted on them?  Greater JHB/PTA please.