Still digging to find
Arizona Silhouette has lots of Boxelder burl colors, but not in Buckeye.
William Woodrite has Boxelder in black/gold, but not in Buckeye. Closest yet.
Woodturningz has Buckeye burl, but not dyed.
Laserlinez.com has four dyed Buckeye burl colors, but no stock, and not in black/gold.
Craft Supplies (woodturnerscatalog.com) has Buckeye Burl in six dyed colors, but not in black/gold (yellow).
Thank you for your suggestions!
Anywhere else you can think of?