"american walnut" is exorbitantly expensive here in America. Walnut's not really an issue of inflation - I guess it's a problem of blight here. What's around for $10 a board foot here is like cabinet sticking. 2x4 lumber here (due to futures) had gone from about $2.50 to $8 per at one point - not sure where it is now. It was just construction lumber and plywood that was way up, but exotics and such (that don't have wide appeal) are unchanged. The walnut issue has crept up over the last decade or so - which is strange, as I haven't seen much demand for it here in finished use (it's just a decline in supply without that being due to absurd demand).
Cherry on the stump here is almost worthless. White oak is relatively high (though that might be slipping) due to distillery disasters making for big demand to replace barrels. Red oak is and always was worth almost nothing, and there's no no organized small market or beech here (it's usually burned).