Any true burl will always find a market here. But you gotta remember burl means different things to different people, and usually even more different between people trying to sell and people interested in buying. If it really is solid burl, with eyes and no straight grain, it should sell well. Be sure to see the exact piece you are buying, and remember that there is a lot of waste and pieces that are ALMOST big enough and solid enough to make a pen out of. (but not quite). Those pieces can usually be cast into WW blanks, but that process is very time consuming, tedious type work, again with a fairly high reject rate, so most people who do it only use wood that is very cheap or free.