I will take this in consideration and might do the necessary changes soon!Like I said make it 299 RPs and 599 E-Cash because it has always been this way and you wanted to make this server newbie-friendly and make it easier to afford for everyone by lowering the prices but lvl 7 stone has much higher price instead and that will make it hard to compete for players who don't have a lot of money or rps.
You might as well make the price even lower because the more people can afford it, the more people will buy it and the more money your company will make this way. To be honest you should consider lowering all the prices of the items because that can only bring profit in my opinion.