Not too much at the moment, but it has serious potential to go higher. You've got the harder levels out of the way. Just work on it a bit more, and it'll spike in price. Also, not sure if you have 30 slayer, if you don't, I'd recommend you get it, it raises xp/h by 15k/h+ when botting soulwars .
At this stage, I'd estimate the price around $40-50.