Somewhere between 2kce and 5kce. God knows where exactly though since the prices of all accessories are all over the place, and we still have no real gague on how much rare the specially themed items actually are. Best advise is to put it to auction and try and get as much as possible before hype start to settle.
More right now, since people are still unsure about rarity/drop rates.
Personally, I'd try and sell it quickly before people realize how dumb the Mecha Wings look ;D
Price it against the other mecha wings CR average, and add a premium since Volcanic matches the Vog Cub set, and is a rarer skinned accessory.