I see people locally around here on facebook trying to sell their burls (maple, walnut, cherry usually) for upwards of $600 and most are about that size. Granted, their ask is not necessarily what they might get paid for it. Especially given our very rural area, I doubt they'd get that price locally, I imagine they are hoping some city slicker sees their ad and bites on it... Me, I might pay $50 to $100 for a burl like that , unless it was already well cut so I could see whats inside.. I'd count myself lucky if I made the money back out of local farmer's market sales.. I imagine in a bigger suburban area the burl might go for considerably more than $500