do you mean 2nd hand (premade) or forged?
if you mean the first, just post a market thread and see if someone has what you'd like
people usually sell single hand flames for 30k-50k (if decent)
if you mean forged, i'd imagine you're going to request one, if not, you can just forge it,
save the setting (screenshot) and check how much it'd cost.
if you're requesting it, ask a flameforger like furryprints. he also only charges you the
forge price to forge it for you.