I have several pieces of driftwood for sale. Local sales only sorry. Prices range from FREE w/purchase to $25. I'm located in Queens, NYC. Sorry for the cluttered pics, but let me know which one you're interested and I'll give you the dimensions. Thanks.
Zack, the driftwood w/the base and pebbles is 28" long and 12" at the highest peak. When it was in my 55 gallon, it looked a little too big. For a 120 or 150, it's prob perfect. But not sure about a 180 since it added height. It's your call.