Blooms and Branches. They specialize in selling wood for decoration, and the burls that cannot be sold normally are set aside for customers to pick out exactly what they want. They know what we want, it's listed under terrarium supplies under their website. Have two burls from them that make a nice jungle gym + basking spot for my Arthhur, and I plan on buying more soon since he won't touch any other climbing surface in his viv aside from the background. I'm partial to grapewood, myself.