Burls take a long time to dry. Took almost 2 years to dry a good size burl I had. Burls have a tendency to crack and check anywhere. Lots of websites sell wood blanks. There is a private facebook page called callnuts, and there are alot of guys on there that sell burl blanks of all kinds, and are stabilized and ready to turn. I get alot of my wood from a local saw mill. Look for a local mill in your area.